G11B

INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R

This subclass covers :

recording or playback of information by relative movement between a record track and a transducer, the transducer directly producing, or being directly actuated by, modulation in the track being recorded or played-back, and the extent of modulation corresponding to the signal being recorded or played-back;

apparatus and machines for recording or playback, and parts thereof such as heads;

record carriers for use with such apparatus and machines;

associated working of other apparatus with such apparatus and machines;

relative positioning or movement of transducers and record carriers before, during or after transducing operation, e.g. for accessing record carriers or parts thereof, or for track change, selection or acquisition or for track following or for accessing parts of tracks;

driving or moving of heads or record carriers or both heads and record carriers for increasing, maintaining or decreasing the relative speed before, during or after transducing operation

In this subclass, the following terms or expressions are used with the meanings indicated :

"head" includes any means for converting sinusoidal or non-sinusoidal electric wave-forms into variations of the physical condition of at least the adjacent surface of the record carrier, or vice versa;

"record carrier" means a body, such as a cylinder, disc, card, tape, or wire, capable of permanently holding information, which can be read-off by a sensing element movable relatively to the record carrier.

Documents concerning relative positioning or movement of transducers and record carriers are classified in groups G11B3/00 - G11B7/00 and G11B21/00 when only the transducer is controlled and in groups G11B15/00, G11B17/00 and G11B19/00 when only the record carrier is controlled. When both record carrier and head are controlled, the documents are classified in G11B15/1808, G11B15/1816, G11B19/00 and G11B27/002.
When a plurality of record carriers are controlled, the documents are classified in G11B15/68, G11B17/08, G11B17/22 and G11B27/002.

By "access" is meant an operation including a relative movement for positioning between record carrier and head before, during or after transducing; this operation including "seek", "select", "change", "acquire" and "follow" functions for at least a part of a track on at least one record carrier. By "programmed access" is meant a sequence of access operations the result of the sequence being to acquire a wanted sequence of parts of tracks or a wanted sequence of tracks. Relative movement between head and record carrier also covers the movement of a coupling beam such as a light beam between the head and a stationary record carrier.

"Movement of the head" also covers any virtual movement or any physical movement such as obtained by switching between successive transducing parts of the head or by moving the transducing zone of the head, i.e. by "scanning". If different transducing parts of the head are switchable, the number of transducing parts should be much smaller than the number of individual storage areas of the record carrier.

Attention is drawn to the notes of subclass G11C.

The following IPC groups are not in the CPC scheme. The subject matter for these IPC groups is classified in the following CPC groups:

G11B5/673

covered by G11B5/66 and G11B5/672 - G11B5/678

G11B5/738

covered by G11B5/73, G11B5/733, G11B5/7334 and G11B5/736 - G11B5/7377

G11B7/30

covered by

G11B7/00

In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.

G11B3/00

Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits

Reproducing by mechanical sensing

Record carriers therefor G11B11/00,

G11B13/00

take precedence

G11B3/001

with vibrating mechanical coupling means between pick-up element and sound producing element

G11B3/002

element with stationary record carriers

G11B3/003

Devices for transmitting, directing, amplifying sound in general G10K11/18

G11B3/005

through hollow arms

G11B3/006

using horns

G11B3/007

Devices for controlling sound, e.g. using acoustical impedances, using valves

G11B3/008

for digital information

G11B3/02

Arrangements of heads

G11B3/04

Multiple, convertible, or alternative transducing arrangements

G11B3/06

Determining or indicating positions of head

G11B3/08

Raising, lowering, traversing otherwise than for transducing, arresting, or holding-up heads against record carriers

for transducing G11B3/12, G11B3/34

G11B3/085

using automatic means G11B3/095 takes precedence

; if particularly adapted for record-changers see G11B17/16 and subgroups

G11B3/08503

Control of drive of the head

G11B3/08506

for pivoting pick-up arms

G11B3/08509

using mechanical detecting means

G11B3/08512

using optical detecting means

G11B3/08516

using magnetic detecting means

G11B3/08519

for pick-up arms moving parallel to itself

G11B3/08522

using mechanical detecting means

G11B3/08525

using optical detecting means

G11B3/08529

using magnetic or electric detecting means

G11B3/08532

for fixed arms carrying a movable head

G11B3/08535

Driving the head

G11B3/08538

the head being driven by the same means as the record can

G11B3/08541

for pivoting pick-up arms

G11B3/08545

driven by cams

G11B3/08548

using friction coupling

G11B3/08551

for the horizontal movement only

G11B3/08554

for pick-up arms moving parallel to itself

G11B3/08558

driven by belt or analogous element

G11B3/08561

driven by non-skip driving means, e.g. lead screw

G11B3/08564

the head being driven by means independent of the record carrier driving means

G11B3/08567

for pivoting pick-up arms

G11B3/0857

driven by means which support the pick-up arm

G11B3/08574

the supporting element being different from the rotation-axes

G11B3/08577

for the vertical movement only

G11B3/0858

using mechanical means

G11B3/08583

using electrical/magnetic means

G11B3/08587

for pick-up arm moving parallel to itself

G11B3/0859

driven by belt or analogous element

G11B3/08593

driven by non-skip driving means, e.g. lead screw

G11B3/08596

for fixed arms carrying a movable head

G11B3/09

using manual means only G11B3/095 takes precedence

G11B3/091

using magnetic means G11B3/093 takes precedence

G11B3/092

using mechanical means G11B3/093 takes precedence

G11B3/093

Means coupled to the cover

G11B3/095

for repeating a part of the record

for beginning or stopping at a desired point of the record

G11B3/0952

using automatic means

G11B3/0955

using mechanical means for detecting the end of the recording

G11B3/0957

using optical means for detecting the end of the recording or the desired point thereof

G11B3/10

Arranging, supporting, or driving of heads or of transducers relatively to record carriers

guiding record carriers G11B17/00, driving record carriers G11B19/00

G11B3/12

Supporting in balanced, counterbalanced or loaded operative position

during transducing

, e.g. loading in direction of traverse

G11B3/121

By using mechanical means not provided for in G11B3/14, G11B3/20, e.g. using cams

G11B3/122

Providing horizontal force, e.g. anti-skating G11B3/124 takes precedence

G11B3/124

Damping means therefor

G11B3/125

by using electric or magnetic means

G11B3/127

Providing horizontal force, e.g. anti-skating force G11B3/128 takes precedence

G11B3/128

Damping means therefor

G11B3/14

by using effects of gravity or inertia, e.g. counterweight G11B3/28 takes precedence

G11B3/145

Providing horizontal force, e.g. anti-skating force G11B3/18 takes precedence

G11B3/16

adjustable

G11B3/18

Damping by using viscosity effect

G11B3/20

by elastic means, e.g. spring G11B3/28 takes precedence

G11B3/22

adjustable

G11B3/24

acting to decrease pressure on record

G11B3/26

acting to increase pressure on record

G11B3/28

providing transverse bias parallel to record

see provisionally also G11B3/14, G11B3/20 )

G11B3/30

Supporting in an inoperative position

G11B3/31

Construction of arms

for transmitting, directing or amplifying sound G11B3/003

G11B3/32

Construction or arrangement of support pillars

G11B3/34

Driving or guiding during transducing operation

G11B3/36

Automatic-feed mechanisms producing progressive transducing traverse across record carriers otherwise than by grooves, e.g. by lead-screw

G11B3/38

Guiding, e.g. constructions or arrangements providing linear or other special tracking characteristics

G11B3/40

Driving of heads relatively to stationary record carriers for transducing

G11B3/42

with provision for adaptation or interchange of heads

G11B3/44

Styli, e.g. sapphire, diamond

G11B3/445

Styli particularly adapted for sensing video discs

G11B3/46

Constructions or forms

Disposition or mounting

, e.g. attachment of point to shank

attachment of stylus directly to transducer H04R1/16

G11B3/48

Needles

G11B3/50

Anvils or other supports opposing stylus forces

G11B3/52

Arrangements permitting styli to yield under excessive pressure

G11B3/54

Storing

Manipulating, e.g. feeding styli to and from heads

G11B3/56

Sharpening grinding B24B3/00, B24B19/00

G11B3/58

Cleaning record carriers or styli, e.g. removing shavings or dust

or electrostatic charges

G11B3/5809

during transducing operation

G11B3/5818

for record carriers

G11B3/5827

using means contacting the record carrier

G11B3/5836

means connected to the pick-up arm or head

G11B3/5845

means connected to a separate arm

G11B3/5854

using means not contacting the record carrier

G11B3/5863

connected to the pick-up arm or head

G11B3/5872

connected to a separate arm

G11B3/5881

for styli or needles only

G11B3/589

before or after transducing operation

G11B3/60

Turntables for record carriers

contains no documents, see

G11B19/2009

G11B3/61

Damping of vibrations of record carriers on turntables

see provisionally also G11B3/60, G11B3/589 and G11B17/02; contains no documents, see

G11B19/2018

G11B3/64

Re-recording, i.e. transcribing information from one grooved record carrier on to one or more similar or dissimilar record carriers

by varying the order of the information G11B27/029, G11B27/036

G11B3/66

Erasing information, e.g. for reuse of record carrier

G11B3/68

Record carriers

G11B3/682

comprising protective coatings, e.g. anti static, anti-friction

G11B3/685

Intermediate mediums

G11B3/687

Testing thereof investigating chemical or physical properties of materials G01N

G11B3/70

characterised by the selection of material or structure

Processes or apparatus specially adapted for manufacturing record carriers

G11B3/702

for video discs with grooves G11B3/705 takes precedence

G11B3/705

characterised by the selection of the material only

G11B3/707

for video discs with grooves

G11B3/72

Groove formations, e.g. run-in groove, run-out groove

G11B3/74

Multiple output tracks, e.g. binaural stereophonic

G11B3/76

forming part of cinematograph films

G11B3/78

Multiple-track arrangements

G11B3/80

incorporating subsidiary guide means for heads, other than modulated grooves

Part-formed unmodulated grooves for conversion into transducing grooves

G11B3/90

with means indicating prior or unauthorised use

G11B5/00

Recording by magnetisation or demagnetisation of a record carrier

Reproducing by magnetic means

Record carriers therefor

G11B11/00

and G11B13/00

take precedence

Subgroups G11B5/02 - G11B5/86 take precedence over subgroups G11B5/004 - G11B5/016

G11B2005/0002

Special dispositions or recording techniques

G11B2005/0005

Arrangements, methods or circuits

G11B2005/0008

Magnetic conditionning of heads, e.g. biasing

G11B2005/001

Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure

G11B2005/0013

of transducers, e.g. linearisation, equalisation

G11B2005/0016

of magnetoresistive transducers

G11B2005/0018

by current biasing control or regulation

G11B2005/0021

Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal

G11B2005/0024

Microwave assisted recording

G11B2005/0026

Pulse recording

G11B2005/0029

using magnetisation components of the recording layer disposed mainly perpendicularly to the record carrier surface

G11B2005/0032

Transducing means or record carriers including or interacting with each other through interposition of, a physically controllable magnetic flux masking or focusing element

G11B2005/0034

switchable at least locally between two different physical states, e.g. magnetic and non-magnetic

G11B2005/0037

using superconductive elements

G11B5/004

Recording on, or reproducing or erasing from, magnetic drums G11B19/00 takes precedence

G11B5/008

Recording on, or reproducing or erasing from, magnetic tapes,

sheets, e.g. cards,

or wires

G11B15/00

G11B19/00

take precedence;

bulk transferring of information magnetisation for re-recording G11B5/865; marking record carriers in digital fashion G06K

G11B5/00804

magnetic sheets rotating sheets G11B5/012

G11B5/00808

magnetic cards

G11B5/00813

magnetic tapes

G11B5/00817

on longitudinal tracks only, e.g. for serpentine format recording

G11B5/00821

using stationary heads

G11B5/00826

comprising a plurality of single poles or gaps or groups thereof operative at the same time

G11B5/0083

for parallel information processing, e.g. PCM recording

G11B5/00834

using virtual scanning heads

G11B5/00839

using cyclically driven heads providing segmented tracks

G11B2005/00843

allowing digital compact cassette [DCC] format recording

G11B5/00847

on transverse tracks G11B5/00878 takes precedence

G11B5/00852

using stationary heads

G11B5/00856

comprising a plurality of single poles or gaps or groups thereof operative in time sequence

G11B5/0086

using cyclically driven heads providing segmented tracks

G11B5/00865

for transducing on more than one segment simultaneously

G11B5/00869

the segments being disposed in different lateral zones of the tape

G11B5/00873

the segments being disposed in different longitudinal zones of the tape

G11B5/00878

transducing different track configurations or formats on the same tape

G11B5/00882

configurations only, e.g. longitudinal and transverse

G11B5/00886

simultaneously

G11B5/00891

formats only, e.g. analog and digital

G11B5/00895

simultaneously

G11B5/012

Recording on, or reproducing or erasing from, magnetic disks G11B17/00, G11B19/00 take precedence

G11B5/016

using magnetic foils

G11B5/02

Recording, reproducing, or erasing methods

Read, write or erase circuits therefor

G11B5/022

H-Bridge head driver circuit, the "H" configuration allowing to inverse the current direction in the head

G11B5/024

Erasing

G11B5/0245

Bulk erasing

G11B5/027

Analogue recording

G11B5/0275

Boundary displacement recording

G11B5/03

Biasing

G11B5/035

Equalising

G11B5/09

Digital recording

G11B5/10

Structure or manufacture of housings or shields for heads

G11B5/102

Manufacture of housing

G11B5/105

Mounting of head within housing

or assembling of head and housing G11B5/3103 takes precedence

G11B5/11

Shielding of head against electric or magnetic fields

G11B5/112

Manufacture of shielding device

G11B5/115

Shielding devices arranged between heads or windings

G11B5/265

, G11B5/29 take precedence

G11B5/127

Structure or manufacture of heads, e.g. inductive

G11B5/1272

Assembling or shaping of elements G11B5/1278 takes precedence

G11B5/1274

with "composite" cores, i.e. cores composed in some parts of magnetic particles and in some other parts of magnetic metal layers

G11B5/1276

including at least one magnetic thin film

G11B5/1278

specially adapted for magnetisations perpendicular to the surface of the record carrier

G11B5/133

with cores composed of particles, e.g. with dust cores, with ferrite cores

with cores composed of isolated magnetic particles in thin films G11B5/31

G11B5/1335

Assembling or shaping of elements

G11B5/147

with cores being composed of metal sheets, i.e. laminated cores

with cores composed of isolated magnetic layers, e.g. sheets in thin films G11B5/31

G11B5/1475

Assembling or shaping of elements G11B5/153 takes precedence

G11B5/153

with tape-wound cores

G11B5/17

Construction or disposition of windings

G11B5/187

Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium

Pole pieces

Gap features G11B5/265,

G11B5/29

, G11B5/31 take precedence

G11B5/1871

Shaping or contouring of the transducing or guiding surface

G11B5/1872

for improving the form of the electrical signal transduced, e.g. compensation of "contour effect"

G11B5/1874

specially adapted for composite pole pieces, e.g. for avoiding "pseudo-gap"

G11B5/1875

"Composite" pole pieces, i.e. poles composed in some parts of magnetic particles and in some other parts of magnetic metal layers

G11B5/1877

including at least one magnetic thin film

G11B5/1878

disposed immediately adjacent to the transducing gap, e.g. "Metal-In-Gap" structure

G11B5/193

the pole pieces being ferrite

or other magnetic particles G11B5/1871 takes precedence; in thin film G11B5/31

G11B5/21

the pole pieces being of ferrous sheet metal

or other magnetic layers G11B5/1871 takes precedence; in thin film G11B5/31

G11B5/23

Gap features

G11B5/1871, G11B5/1875, G11B5/265, G11B5/29, G11B5/488 and subgroups, G11B5/4907 and subgroups, G11B5/4969 and subgroups take precedence

G11B5/232

Manufacture of gap

G11B5/235

Selection of material for gap filler

G11B5/232 takes precedence

G11B5/245

comprising means for controlling the reluctance of the magnetic circuit

in a head with single gap, for co-operation with one track

G11B5/255 takes precedence

G11B5/2452

where the dimensions of the effective gap are controlled

G11B5/2455

the magnetic circuit including at least one magnetic thin film of controllable properties for scanning G11B5/4938

G11B5/2457

disposed immediately adjacent to the gap "composite" pole pieces G11B5/1877

G11B5/255

comprising means for protection against wear

in thin film structures G11B5/3106

G11B5/265

Structure or manufacture of a head with more than one gap for erasing, recording or reproducing on the same track G11B5/33 takes precedence

in thin film structures G11B5/31

G11B5/2651

Manufacture

G11B5/2652

with more than one gap simultaneously operative with controlled single gap G11B5/245

G11B5/2654

for recording or erasing

G11B5/2655

with all the gaps disposed within the track or "guard band" between tracks, e.g. with erase gaps operative on track edges, with wide erase gap followed by narrow write gap

G11B5/2657

all the gaps having the same dimension in the direction transverse to the track direction

G11B5/2658

for recording with premagnetization or biasing of record carrier or head

G11B5/29

Structure or manufacture of unitary devices formed of plural heads for more than one track

G11B5/33, G11B5/49 and subgroups take precedence; in thin film structure G11B5/31

G11B5/295

Manufacture

G11B5/31

using thin films

G11B5/1274, G11B5/1278, G11B5/1874, G11B5/1875, G11B5/33, G11B5/49 take precedence; magnetic thin film structures H01F10/00

G11B5/3103

Structure or manufacture of integrated heads or heads mechanically assembled and electrically connected to a support or housing

G11B5/3106

where the integrated or assembled structure comprises means for conditioning against physical detrimental influence, e.g. wear, contamination G11B5/3133 takes precedence

G11B5/3109

Details G11B5/3103 takes precedence

G11B5/3113

for improving the magnetic domain structure or avoiding the formation or displacement of undesirable magnetic domains

G11B5/3116

Shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect, equalizing, side flux fringing, cross talk reduction between heads or between heads and information tracks G11B5/3113, G11B5/245 take precedence

G11B5/312

for reducing flux leakage between the electrical coil layers and the magnetic cores or poles or between the magnetic cores or poles

G11B5/3123

by using special coil configurations or conductors

G11B5/3126

using superconductors

G11B5/313

Disposition of layers

G11B5/3133

including layers not usually being a part of the electromagnetic transducer structure and providing additional features, e.g. for improving heat radiation, reduction of power dissipation, adaptations for measurement or indication of gap depth or other properties of the structure G11B5/3106 takes precedence

G11B5/3136

for reducing the pole-tip-protrusion at the head transducing surface, e.g. caused by thermal expansion of dissimilar materials

G11B5/314

where the layers are extra layers normally not provided in the transducing structure, e.g. optical layers G11B5/3196 takes precedence

G11B5/3143

including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding G11B5/3116, G11B5/312 take precedence

G11B5/3146

magnetic layers

G11B5/315

Shield layers on both sides of the main pole, e.g. in perpendicular magnetic heads

G11B5/3153

including at least one magnetic thin film coupled by interfacing to the basic magnetic thin film structure

G11B5/3156

providing interaction by induced or exchange coupling

G11B5/3159

superconductive layers

G11B5/3163

Fabrication methods or processes specially adapted for a particular head structure, e.g. using base layers for electroplating, using functional layers for masking, using energy or particle beams for shaping the structure or modifying the properties of the basic layers

G11B5/3166

Testing or indicating in relation thereto, e.g. before the fabrication is completed

G11B5/3169

Working or finishing the interfacing surface of heads, e.g. lapping of heads

G11B5/3173

Batch fabrication, i.e. producing a plurality of head structures in one batch

G11B5/3176

Structure of heads comprising at least in the transducing gap regions two magnetic thin films disposed respectively at both sides of the gaps G11B5/2455, G11B5/265 take precedence; composite magnetic head structures, e.g. "Metal-In-Gap" heads are classified in G11B5/127 or G11B5/187 and subgroups

G11B5/3179

the films being mainly disposed in parallel planes

G11B5/3183

intersecting the gap plane, e.g. "horizontal head structure"

G11B5/3186

parallel to the gap plane, e.g. "vertical head structure"

G11B5/3189

Testing

G11B5/3193

of films or layers, e.g. continuity test

G11B5/3196

of thin magnetic films, e.g. functional testing of the transducing properties G11B5/455 takes precedence

G11B5/325

Erasing heads using permanent magnets general details therefor G11B5/133 - G11B5/255

G11B5/33

Structure or manufacture of flux-sensitive heads,

i.e. for reproduction only; Combination of such heads with means for recording or erasing only

Single head using magnetic domains for scanning G11B5/4946; multiple head for scanning G11B5/4907 and subgroups

; general details therefor G11B5/133 - G11B5/255

G11B5/332

using thin films G11B5/372, G11B5/3903 take precedence

G11B5/335

with saturated jig, e.g. for detecting second harmonic

balanced flux head

G11B5/35

having vibrating elements

G11B5/37

using galvano-magnetic devices, e.g. Hall-effect devices G11B5/39 takes precedence

using Hall or Hall-related effect, e.g. planar-Hall effect or pseudo-Hall effect

G11B5/372

in magnetic thin films

G11B5/374

Integrated structures

G11B5/376

in semi-conductors G11B5/372 takes precedence

G11B5/378

Integrated structures

G11B5/39

using magneto-resistive devices

or effects

G11B5/3903

using magnetic thin film layers or their effects, the films being part of integrated structures

G11B5/3906

Details related to the use of magnetic thin film layers or to their effects

G11B5/3909

Arrangements using a magnetic tunnel junction

G11B5/3912

Arrangements in which the active read-out elements are transducing in association with active magnetic shields, e.g. magnetically coupled shields G11B5/3916 takes precedence

G11B5/3916

Arrangements in which the active read-out elements are coupled to the magnetic flux of the track by at least one magnetic thin film flux guide

G11B5/3919

the guide being interposed in the flux path

G11B5/3922

the read-out elements being disposed in magnetic shunt relative to at least two parts of the flux guide structure

G11B5/3925

the two parts being thin films

G11B5/3929

Disposition of magnetic thin films not used for directly coupling magnetic flux from the track to the MR film or for shielding

G11B5/3932

Magnetic biasing films

G11B5/3935

Flux closure films not being part of the track flux guides

G11B5/3938

the flux closure films being used for absorbing or reducing demagnetisating or saturating fields

G11B5/3941

the flux closure films being used for providing a closed magnetic circuit to the MR film

G11B5/3945

Heads comprising more than one sensitive element

G11B5/3948

the sensitive elements being active read-out elements

G11B5/3951

the active elements being arranged on several parallel planes

G11B5/3954

the active elements transducing on a single track

G11B5/3958

the active elements being arranged in a single plane, e.g. "matrix" disposition

G11B5/3961

disposed at an angle to the direction of the track or relative movement

G11B5/3964

for transducing on a single track

G11B5/3967

Composite structural arrangements of transducers, e.g. inductive write and magnetoresistive read G11B5/3906 takes precedence

G11B5/397

with a plurality of independent magnetoresistive active read-out elements for respectively transducing from selected components

G11B5/3974

from the same information track, e.g. frequency bands

G11B5/3977

from different information tracks

G11B5/398

Specially shaped layers

G11B5/3983

with current confined paths in the spacer layer

G11B5/3987

with provision for closing the magnetic flux during operation

G11B5/399

with intrinsic biasing, e.g. provided by equipotential strips

G11B5/3993

in semi-conductors

G11B2005/3996

large or giant magnetoresistive effects [GMR], e.g. as generated in spin-valve [SV] devices

G11B5/40

Protective measures on heads, e.g. against excessive temperature G11B5/31 takes precedence; protection against wear G11B5/255

protective structure of the head: see under structures, e.g. G11B5/3106

G11B5/41

Cleaning of heads

of record carriers G11B23/50

G11B5/455

Arrangements for functional testing of heads

Measuring arrangements for heads

G11B5/4555

by using a spin-stand, i.e. a spinning disc or simulator

G11B5/465

Arrangements for demagnetisation of heads

G11B5/48

Disposition or mounting of heads

or head supports

relative to record carriers

mounting of head within housing G11B5/105; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed driving of both record carriers and head G11B15/18; guiding record carriers G11B15/60; head selecting circuits G11B15/12

G11B5/4806

specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives G11B5/488 - G11B5/54 take precedence

G11B5/4813

Mounting or aligning of arm assemblies, e.g. actuator arm supported by bearings, multiple arm assemblies, arm stacks or multiple heads on single arm G11B5/484 takes precedence

G11B5/4826

Mounting, aligning or attachment of the transducer head relative to the arm assembly, e.g. slider holding members, gimbals, adhesive G11B5/484 takes precedence; details of head housings or structures G11B5/10, G11B5/127; adjustment relative to the record carrier G11B5/56

G11B5/483

Piezo-electric devices between head and arm, e.g. for fine adjustment

G11B5/4833

Structure of the arm assembly, e.g. load beams, flexures, parts of the arm adapted for controlling vertical force on the head G11B5/484 takes precedence

G11B5/484

Integrated arm assemblies, e.g. formed by material deposition or by etching from single piece of metal or by lamination of materials forming a single arm/suspension/head unit

G11B5/4846

Constructional details of the electrical connection between arm and support

G11B5/4853

Constructional details of the electrical connection between head and arm

G11B5/486

with provision for mounting or arranging electrical conducting means or circuits on or along the arm assembly

G11B5/4866

the arm comprising an optical waveguide, e.g. for thermally-assisted recording

G11B5/4873

the arm comprising piezoelectric or other actuators for adjustment of the arm

G11B5/488

Disposition of heads G11B5/49, G11B5/52 take precedence

G11B5/4886

relative to rotating disc

G11B5/4893

relative to moving tape

G11B5/49

Fixed mounting

or arrangements, e.g. one head per track

G11B5/4907

Details for scanning G11B5/4969 takes precedence

G11B5/4915

Structure of specially adapted heads G11B5/3906 takes precedence

G11B5/4923

in which zones of the transducing part are being physically controllable

G11B5/493

Control of magnetic properties, e.g. saturation, anisotropy

G11B5/4938

of thin magnetic films

G11B5/4946

for formation or displacement of magnetic domains, e.g. walls, bubbles

G11B5/4953

part of the structure being mechanically or magnetically coupled to or decoupled from, the transducing part

G11B5/4961

Circuits

G11B5/4969

Details for track selection or addressing

G11B5/4976

Disposition of heads, e.g. matrix arrangement

G11B5/4984

Structure of specially adapted switching heads G11B5/3958 takes precedence

G11B5/4992

Circuits

G11B5/50

Interchangeable mountings, e.g. for replacement of head without readjustment

G11B5/52

with simultaneous movement of head and record carrier, e.g. rotation of head G11B5/588 takes precedence

G11B5/53

Disposition or mounting of heads on rotating support

G11B5/531

Disposition of more than one recording or reproducing head on support rotating cyclically around an axis

G11B5/532

Parallel to the direction of movement of the tape, e.g. for transversal scanning

G11B5/534

inclined relative to the direction of movement of the tape, e.g. for helicoidal scanning

G11B5/535

perpendicular to the direction of movement of the tape, e.g. for longitudinal scanning

G11B5/537

with all the heads disposed in a plane substantially parallel to the plane of the tape, e.g. for circular scanning

G11B5/538

Disposition or mounting of pole pieces on rotating support magnetic switching of fixed head arrangements G11B5/49

G11B5/54

with provision for moving the head into or out of its operative position or across tracks

G11B5/55

Track change, selection or acquisition by displacement of the head

G11B5/5504

across tape tracks

G11B5/5508

Control circuits therefor G11B5/5513 takes precedence

G11B5/5513

Specially adapted for transducing in both travelling directions of tape

G11B5/5517

Controlled by automatic tape drive reversing arrangement reversing tape drive arrangements G11B15/444

G11B5/5521

across disk tracks spiral track following G11B5/596

For groups G11B5/5526 - G11B5/5582, see provisionally G11B5/5521 and G11B5/596

G11B5/5526

Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof G11B5/556 takes precedence

G11B5/553

Details

G11B5/5534

Initialisation, calibration, e.g. cylinder "set-up"

G11B5/5539

Skew adjustment, e.g. adjustment of the position of the first sector in each track with respect to the other tracks, for improving, e.g. access performance

G11B5/5543

servo-format therefor

G11B5/5547

"Seek" control and circuits therefor G11B5/5556 takes precedence

G11B5/5552

using fine positioning means for track acquisition separate from the coarse (e.g. track changing) positioning means

G11B5/5556

with track following after a "seek"

G11B5/556

control circuits therefor

G11B5/5565

system adaptation for compensation of variations of physical parameters, e.g. temperature

G11B5/5569

details of specially adapted mobile parts, e.g. electromechanical control devices motors in general H02K

G11B5/5573

Details of the magnetic circuit, e.g. of actuators

G11B5/5578

Multiple actuators addressing the same disk, e.g. to improve data rate or access rate

G11B5/5582

system adaptation for working during or after external perturbation, e.g. in the presence of a mechanical oscillation caused by a shock

G11B5/5586

Minimising seek noise, e.g. actuator noise

G11B5/5591

across drum tracks

G11B5/5595

Control circuits therefor

G11B5/56

with provision for moving the head

support

for the purpose of adjusting the position of the head relative to the record carrier, e.g. manual adjustment for azimuth correction or track centering

G11B5/52,

G11B5/54, G11B5/58 take precedence

G11B5/58

with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following

spacing means incorporated in the head structure G11B5/187, G11B5/255, G11B5/3106

G11B5/581

maintaining desired contact or spacing by direct interaction of forces generated between heads or supports thereof and record carriers or supports thereof, e.g. attraction-repulsion interactions

G11B5/582

interactions in a magnetic field

G11B5/583

using repulsion generated by superconductors in a magnetic field, e.g. by "Meissner effect"

G11B5/584

for track following on tapes

G11B5/588

by controlling the position of the rotating heads by controlling the speed of the record carrier G11B15/467; by controlling speed of the heads G11B15/473;

by moving the transducing part of the head relative to the headwheel, in the direction of the scanning movement G11B15/1841

G11B5/592

using bimorph elements supporting the heads

see provisional also G11B5/588

G11B5/5921

using auxiliary signals, e.g. pilot signals

G11B5/5922

superimposed on the main signal

G11B5/5923

recorded in horizontal suppression internal of video frame

G11B5/5925

recorded in vertical suppression internal of video frame

G11B5/5926

recorded in separate tracks, e.g. servo tracks

G11B5/5927

Helicoidal tracks

G11B5/5928

Longitudinal tracks

G11B5/596

for track following on disks

G11B5/5526, G11B5/5552, G11B5/5565, G11B5/5582 take precedence

For groups G11B5/59605 - G11B5/59633, see provisionally G11B5/5521 and G11B5/596

G11B5/59605

Circuits G11B5/59627 - G11B5/59688 take precedence

G11B5/59611

Detection or processing of peak/envelop signals

G11B5/59616

Synchronisation; Clocking G11B5/59622 takes precedence

G11B5/59622

Gain control; Filters

G11B5/59627

Aligning for runout, eccentricity or offset compensation G11B5/5534, G11B5/59677, G11B5/59688 take precedence

G11B5/59633

Servo formatting G11B5/59627, G11B5/59677, G11B5/59683, G11B5/59688 take precedence

G11B5/59638

Servo formatting apparatuses, e.g. servo-writers

G11B5/59644

Acquisition or selection of servo format from a system reference after track seek G11B5/5556

G11B5/5965

Embedded servo format G11B5/59655 takes precedence

G11B5/59655

Sector, sample or burst servo format

G11B5/59661

Spiral servo format

G11B5/59666

Self servo writing

G11B5/59672

Servo re-writing, e.g. for the correction of offsets or 'fading' of servo marks

G11B5/59677

with optical servo tracking

G11B5/59683

for magnetoresistive heads

G11B5/59688

Servo signal format patterns or signal processing thereof, e.g. dual, tri, quad, burst signal patterns

G11B5/59694

System adaptation for working during or after external perturbation, e.g. in the presence of a mechanical oscillation caused by a shock

G11B5/60

Fluid-dynamic spacing of heads from record-carriers

G11B5/6005

Specially adapted for spacing from a rotating disc using a fluid cushion

G11B5/6011

Control of flying height

G11B5/6017

using capacitive measurement

G11B5/6023

using inductive measurement

G11B5/6029

Measurement using values derived from the data signal read from the disk

G11B5/6035

using electrostatic forces

G11B5/6041

using magnetic forces

G11B5/6047

using magnetostrictive means

G11B5/6052

using optical means

G11B5/6058

using piezoelectric means

G11B5/6064

using air pressure

G11B5/607

using thermal means

G11B5/6076

Detecting head-disk contact

G11B5/6082

Design of the air bearing surface

G11B5/6088

Optical waveguide in or on flying head

G11B5/6094

Preventing or discharging electrostatic charge build-up on the flying head

G11B5/62

Record carriers characterised by the selection of the material

This group does not cover compositions, materials or processes, per se, which are covered by the relevant subclasses of section B or C.

G11B5/627

of leaders for magnetic tapes, e.g. non-magnetic strips on the tapes or for connection

G11B5/633

of cinematographic films or slides with integral magnetic track

G11B5/64

comprising only the magnetic material without bonding agent

Group G11B5/64 is impacted by reclassification into groups G11B5/657 - G11B5/658 and G11B5/672 - G11B5/678.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/642

self supporting magnetic material, e.g. magnetisable wires

G11B5/65

characterised by its composition G11B5/66 takes precedence

Group G11B5/65 is impacted by reclassification into groups G11B5/657 - G11B5/658.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/653

containing Fe or Ni containing Co G11B5/656; containing inorganic, non-oxide compounds of Si, N, P, B, H or C G11B5/657; containing oxygen G11B5/658

Group G11B5/653 is impacted by reclassification into groups G11B5/657 - G11B5/658.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/656

containing Co containing inorganic, non-oxide compounds of Si, N, P, B, H or C G11B5/657; containing oxygen G11B5/658

Group G11B5/656 is impacted by reclassification into groups G11B5/657 - G11B5/658.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/657

containing inorganic, non-oxide compound of Si, N, P, B, H or C, e.g. in metal alloy or compound containing oxygen G11B5/658

Group G11B5/657 is incomplete pending reclassification of documents from groups G11B5/64 and G11B5/65 - G11B5/656.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/658

containing oxygen, e.g. molecular oxygen or magnetic oxide

Group G11B5/658 is incomplete pending reclassification of documents from groups G11B5/64 and G11B5/65 - G11B5/656.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/66

the record carriers consisting of several layers

Group G11B5/66 is impacted by reclassification into groups G11B5/672 - G11B5/678.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/667

including a soft magnetic layer

Group G11B5/667 is impacted by reclassification into groups G11B5/672 - G11B5/678.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/672

having different compositions in a plurality of magnetic layers, e.g. layer compositions having differing elemental components or differing proportions of elements

Group G11B5/672 is incomplete pending reclassification of documents from groups G11B5/64 and G11B5/66 - G11B5/667.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/674

having differing macroscopic or microscopic structures, e.g. differing crystalline lattices, varying atomic structures or differing roughnesses

Group G11B5/674 is incomplete pending reclassification of documents from groups G11B5/64 and G11B5/66 - G11B5/667.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/676

having magnetic layers separated by a nonmagnetic layer, e.g. antiferromagnetic layer, Cu layer or coupling layer

Group G11B5/676 is incomplete pending reclassification of documents from groups G11B5/64 and G11B5/66 - G11B5/667.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/678

having three or more magnetic layers

Group G11B5/678 is incomplete pending reclassification of documents from groups G11B5/64 and G11B5/66 - G11B5/667.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/68

comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent

G11B5/70

on a base layer

Group G11B5/70 is incomplete pending reclassification of documents from group G11B5/7006.
Groups G11B5/70 and G11B5/7006 should be considered in order to perform a complete search.

G11B5/7006

comprising a magnetic layer on both sides covered with non-magnetic material

Group G11B5/7006 is no longer used for the classification of documents as of 2020-08-01.
The content of this group is being reclassified into groups G11B5/70, G11B5/718 and G11B5/728.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/7013

characterised by the dispersing agent

G11B5/702

characterised by the bonding agent

G11B5/7021

containing a polyurethane or a polyisocyanate

G11B5/7022

containing mixtures of polyurethanes or polyisocyanates with other polymers

G11B5/7023

containing polyesters, polyethers, silicones, polyvinyl resins, polyacrylresins or epoxy resins G11B5/7022 takes precedence

G11B5/7025

containing cellulosic derivates G11B5/7022 takes precedence

G11B5/7026

Radiation curable polymers

G11B5/7027

Graft polymers

G11B5/7028

Additives, e.g. crosslinking agents

G11B5/706

characterised by the composition of the magnetic material

G11B5/70605

metals or alloys

G11B5/7061

with a non-magnetic core

G11B5/70615

containing Fe metal or alloys G11B5/70621 takes precedence

G11B5/70621

containing Co metal or alloys

G11B5/70626

containing non-metallic substances

G11B5/70631

with a non-magnetic core

G11B5/70636

CrO₂

G11B5/70642

iron oxides

G11B5/70647

with a skin G11B5/70657 takes precedence

G11B5/70652

gamma - Fe₂ O₃

G11B5/70657

with a skin

G11B5/70663

Preparation processes specially adapted therefor, e.g. using stabilising agents G11B5/70668 and G11B5/70673 take precedence

G11B5/70668

containing a dopant

G11B5/70673

containing Co

G11B5/70678

Ferrites

G11B5/70684

Ferro-ferrioxydes

G11B5/70689

Magnetite

G11B5/70694

Non-stoechiometric ferro-ferrioxydes, e.g. berthollide

G11B5/708

characterised by addition of non-magnetic particles to the layer

G11B5/7085

non-magnetic abrasive particles

G11B5/71

characterised by the lubricant

G11B5/712

characterised by the surface treatment or coating of magnetic particles

G11B5/714

characterised by the dimension of the magnetic particles

G11B5/716

characterised by two or more magnetic layers

G11B5/718

at least one on each side of the base layer

Group G11B5/718 is incomplete pending reclassification of documents from group G11B5/7006.
Groups G11B5/7006 and G11B5/718 should be considered in order to perform a complete search.

G11B5/72

Protective coatings, e.g. anti-static

or antifriction

Group G11B5/72 is impacted by reclassification into groups G11B5/7253 - G11B5/728.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/722

containing an anticorrosive material

Group G11B5/722 is impacted by reclassification into groups G11B5/7253 - G11B5/728.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/725

containing a lubricant

, e.g. organic compounds inorganic carbon protective coating G11B5/727

Group G11B5/725 is impacted by reclassification into groups G11B5/7253 - G11B5/728.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/7253

Fluorocarbon lubricant

Groups G11B5/7253 - G11B5/7257 are incomplete pending reclassification of documents from groups G11B5/72 -G11B5/725.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/7257

Perfluoropolyether lubricant

G11B5/726

Two or more protective coatings inorganic carbon protective coating G11B5/727

Groups G11B5/726 - G11B5/7268 are incomplete pending reclassification of documents from groups G11B5/72 - G11B5/725.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/7262

Inorganic protective coating

G11B5/7264

Inorganic carbon protective coating, e.g. graphite, diamond like carbon or doped carbon

G11B5/7266

comprising a lubricant over the inorganic carbon coating

G11B5/7268

comprising elemental nitrogen in the inorganic carbon coating

G11B5/727

Inorganic carbon protective coating, e.g. graphite, diamond like carbon or doped carbon

Group G11B5/727 is incomplete pending reclassification of documents from groups G11B5/72 - G11B5/725.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/728

containing a bonding agent in the protective coating

Group G11B5/728 is incomplete pending reclassification of documents from groups G11B5/7006 and G11B5/72 - G11B5/725.
All groups listed in this Warning should be considered in order to perform a complete search.

G11B5/73

Base layers

, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer

G11B5/733

characterised by the addition of non-magnetic particles

base layers having a non-magnetic layer under a soft magnetic layer G11B5/736; magnetic recording media substrates G11B5/739

This subgroup covers: non-magnetic base layer structures characterised by the addition of non-magnetic particles.

This subgroup does not cover: magnetic layer structures comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent (even when also containing non-magnetic particles), which are covered by G11B5/68 (in particular, G11B5/708 and G11B5/7085).

G11B5/7334

Base layer characterised by composition or structure

G11B5/735

characterised by the back layer

magnetic recording media substrates G11B5/739

G11B5/7353

for a thin film medium where the magnetic recording layer structure has no bonding agent

G11B5/7356

comprising non-magnetic particles in the back layer, e.g. particles of TiO₂, ZnO or SiO₂

G11B5/7358

specially adapted for achieving a specific property, e.g. average roughness [Ra]

G11B5/736

Non-magnetic layer under a soft magnetic layer, e.g. between a substrate and a soft magnetic underlayer [SUL] or a keeper layer magnetic recording media substrates G11B5/739

G11B5/7361

Two or more non-magnetic layers

G11B5/7362

Physical structure of underlayer, e.g. texture

G11B5/7363

Non-magnetic single underlayer comprising nickel

G11B5/7364

Non-magnetic single underlayer comprising chromium

G11B5/7365

Non-magnetic single underlayer comprising a polymeric structure, e.g. polymeric adhesion layer or plasma-polymerized carbon layer

G11B5/7366

for heat-assisted or thermally-assisted magnetic recording [HAMR, TAMR]

G11B5/7367

Physical structure of underlayer, e.g. texture

G11B5/7368

Non-polymeric layer under the lowermost magnetic recording layer base layers having a non-magnetic layer under a soft magnetic layer G11B5/736; magnetic recording media substrates G11B5/739

G11B5/7369

Two or more non-magnetic underlayers, e.g. seed layers or barrier layers

G11B5/737

Physical structure of underlayer, e.g. texture

G11B5/7371

Non-magnetic single underlayer comprising nickel

G11B5/7373

Non-magnetic single underlayer comprising chromium

G11B5/7375

for heat-assisted or thermally-assisted magnetic recording [HAMR, TAMR]

G11B5/7377

Physical structure of underlayer, e.g. texture

G11B5/7379

Seed layer, e.g. at least one non-magnetic layer is specifically adapted as a seed or seeding layer

G11B5/739

Magnetic recording media substrates

G11B5/73911

Inorganic substrates

G11B5/73913

Composites or coated substrates

G11B5/73915

Silicon compound based coating

G11B5/73917

Metallic substrates, i.e. elemental metal or metal alloy substrates

G11B5/73919

Aluminium or titanium elemental or alloy substrates

G11B5/73921

Glass or ceramic substrates

G11B5/73923

Organic polymer substrates

G11B5/73925

Composite or coated non-esterified substrates

G11B5/73927

Polyester substrates, e.g. polyethylene terephthalate

G11B5/73929

comprising naphthalene ring compounds, e.g. polyethylene naphthalate substrates

G11B5/73931

Two or more layers, at least one layer being polyester

G11B5/73933

Surface treated layers, e.g. treated by corona discharge

G11B5/73935

characterised by roughness or surface features, e.g. by added particles

G11B5/73937

Substrates having an organic polymer comprising a ring structure

G11B5/74

Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum

G11B5/743

Patterned record carriers, wherein the magnetic recording layer is patterned into magnetic isolated data islands, e.g. discrete tracks

G11B5/746

Bit Patterned record carriers, wherein each magnetic isolated data island corresponds to a bit

G11B5/76

Drum carriers

G11B5/78

Tape carriers

G11B5/80

Card carriers

G11B5/82

Disk carriers

G11B5/825

flexible discs

G11B5/84

Processes or apparatus specially adapted for manufacturing record carriers

G11B5/8404

manufacturing base layers

G11B5/8408

protecting the magnetic layer

G11B5/8412

treatment by ultrasonics

G11B5/8416

coating a support with a magnetic layer by precipitation

G11B5/842

Coating a support with a liquid magnetic dispersion

G11B5/845

in a magnetic field

G11B5/848

Coating a support with a magnetic layer by extrusion

G11B5/85

Coating a support with a magnetic layer by vapour deposition

G11B5/851

Coating a support with a magnetic layer by sputtering

G11B5/852

Orientation in a magnetic field G11B5/845 takes precedence

G11B5/855

Coating only part of a support with a magnetic layer

G11B5/858

Producing a magnetic layer by electro-plating or electroless plating

G11B5/86

Re-recording, i.e. transcribing information from one magnetisable record carrier on to one or more similar or dissimilar record carriers

by varying the order of the information G11B27/029, G11B27/036

G11B5/865

by contact "printing"

G11B7/00

Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation

by modifying optical properties or the physical structure

, reproducing using an optical beam at lower power

by sensing optical properties

Record carriers therefor G11B11/00, G11B13/00 take precedence

G11B2007/0003

Recording, reproducing or erasing systems characterised by the structure or type of the carrier

G11B2007/0006

adapted for scanning different types of carrier, e.g. CD & DVD

G11B2007/0009

for carriers having data stored in three dimensions, e.g. volume storage

G11B2007/0013

for carriers having multiple discrete layers

G11B2007/0016

for carriers adapted to have label information written on the non-data side by the optical head used for data recording, e.g. lightscribe, labelflash

G11B7/002

Recording, reproducing or erasing systems characterised by the shape

or form

of the carrier

G11B7/0025

with cylinders or cylinder-like carriers

or cylindrical sections or flat carriers loaded onto a cylindrical surface

, e.g. truncated cones

G11B7/003

with webs

, filaments or wires

, e.g. belts, spooled tapes or films of quasi-infinite extent

G11B7/0031

using a rotating head, e.g. helicoidal recording

G11B7/0032

for moving-picture soundtracks, i.e. cinema cameras or projectors with sound recording or reproducing means G03B31/02

G11B7/0033

with cards

or other card-like flat carriers, e.g. flat sheets of optical film

G11B7/0037

with discs

G11B7/00375

arrangements for detection of physical defects, e.g. of recording layer

G11B7/004

Recording, reproducing or erasing methods

Read, write or erase circuits therefor

magneto-optical systems G11B11/105

G11B7/0045

Recording G11B7/006, G11B7/0065 take precedence

G11B7/00451

involving ablation of the recording layer

G11B7/00452

involving bubble or bump forming

G11B7/00453

involving spectral or photochemical hole burning

G11B7/00454

involving phase-change effects

G11B7/00455

involving reflectivity, absorption or colour changes

G11B7/00456

Recording strategies, e.g. pulse sequences G11B7/0062 takes precedence

G11B2007/00457

Two photon recording

G11B7/00458

Verification, i.e. checking data during or after recording

G11B7/005

Reproducing G11B7/0065 takes precedence

G11B7/0051

involving phase depth effects

G11B7/0052

involving reflectivity, absorption or colour changes

G11B7/0053

Reproducing non-user data, e.g. wobbled address, prepits, BCA

G11B7/0055

Erasing G11B7/006, G11B7/0065 take precedence

G11B7/00552

involving colour change media

G11B7/00555

involving liquid crystal media

G11B7/00557

involving phase-change media

G11B7/006

Overwriting G11B7/0065 takes precedence

G11B7/0062

Overwriting strategies, e.g. recording pulse sequences with erasing level used for phase-change media

G11B7/0065

Recording, reproducing or erasing by using optical interference patterns, e.g. holograms

G11B2007/00653

Collinear holography

G11B2007/00656

Counterpropagating holography

G11B7/007

Arrangement of the information on the record carrier, e.g. form of tracks

, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track

G11B2007/00709

Dimensions of grooves or tracks, e.g. groove depth, track pitch

G11B7/00718

Groove and land recording, i.e. user data recorded both in the grooves and on the lands

G11B2007/00727

where the information is modified to form a visible pattern, e.g. forming a label by modifying the width of pits or grooves

G11B7/00736

Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information sector headers or adresses in prepits G11B7/00745; address data in track wobble G11B7/24082

G11B7/00745

Sectoring or header formats within a track formats in general G11B20/12

G11B2007/00754

Track shape, e.g. address or synchronisation information in wobbled track or sidewall

G11B2007/00763

Track cross-section, e.g. V-shaped, trapezoidal

G11B7/00772

on record carriers storing information in the form of optical interference patterns, e.g. holograms

G11B7/00781

Auxiliary information, e.g. index marks, address marks, pre-pits, gray codes

G11B7/0079

Zoned data area, e.g. having different data structures or formats for the user data within data layer, Zone Constant Linear Velocity [ZCLV], Zone Constant Angular Velocity [ZCAV], carriers with RAM and ROM areas

G11B7/013

for discrete information, i.e. where each information unit is stored in a distinct discrete location

, e.g. digital information formats within a data block or sector

G11B2007/0133

Details of discrete information structures, e.g. shape or dimensions of pits, prepits

G11B2007/0136

where each location can have more than two values ('multivalue'), for data or prepits

G11B7/08

Disposition or mounting of heads or light sources relatively to record carriers

G11B7/081

for time base error correction by moving the light beam

G11B7/082

Aligning the head or the light source relative to the record carrier otherwise than during transducing, e.g. adjusting tilt set screw during assembly of head

G11B7/083

relative to record carriers storing information in the form of optical interference patterns, e.g. holograms

G11B7/085

with provision for moving the light beam into, or out of, its operative position

or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection

G11B7/08505

Methods for track change, selection or preliminary positioning by moving the head

G11B7/08511

with focus pull-in only

G11B7/08517

with tracking pull-in only

G11B7/08523

with both tracking and focusing pull-in

G11B7/08529

Methods and circuits to control the velocity of the head as it traverses the tracks

G11B7/08535

to maintain constant velocity during the traverse

G11B7/08541

involving track counting to determine position

G11B7/08547

Arrangements for positioning the light beam only without moving the head, e.g. using static electro-optical elements

G11B7/08552

using electro-optical elements

G11B7/08558

using acousto-optical elements

G11B7/08564

using galvanomirrors

G11B7/0857

Arrangements for mechanically moving the whole head

G11B7/08576

Swinging-arm positioners

G11B7/08582

Sled-type positioners

G11B7/08588

with position sensing by means of an auxiliary system using an external scale

G11B7/08594

to access both sides of the disc with the same head assembly

G11B7/09

with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following

G11B7/0901

for track following only G11B7/0925, G11B7/094, G11B7/0941, G11B7/0943, G11B7/0945, G11B7/0946, G11B7/0948 take precedence

G11B7/0903

Multi-beam tracking systems

G11B7/0904

Dithered tracking systems

G11B7/0906

Differential phase difference systems

G11B7/0908

for focusing only G11B7/0925, G11B7/094, G11B7/0941, G11B7/0943, G11B7/0945, G11B7/0946, G11B7/0948 take precedence

G11B7/0909

by astigmatic methods

G11B7/0911

by far-field method

G11B7/0912

by push-pull method

G11B7/0914

by non-optical methods, e.g. capacitive

G11B7/0916

Foucault or knife-edge methods

G11B7/0917

Focus-error methods other than those covered by G11B7/0909 - G11B7/0916

G11B2007/0919

Critical angle methods

G11B2007/092

Dither methods

G11B2007/0922

Far-field methods

G11B2007/0924

Skewed beams methods (using an angled beam, i.e. a beam which is reflected from the disc at an angle different from 90°)

G11B7/0925

Electromechanical actuators for lens positioning G11B7/0857 takes precedence

G11B7/0927

for focusing only G11B7/0937 takes precedence

G11B7/0929

for tracking only G11B7/0937 takes precedence

G11B7/093

for focusing and tracking G11B7/0932 - G11B7/0937 take precedence

G11B7/0932

Details of sprung supports

G11B7/0933

Details of stationary parts

G11B7/0935

Details of the moving parts

G11B7/0937

Piezo-electric actuators

G11B7/0938

servo format, e.g. guide tracks, pilot signals

G11B7/094

Methods and circuits for servo offset compensation

G11B7/0941

Methods and circuits for servo gain or phase compensation during operation for initialising servos G11B7/0945

G11B7/0943

Methods and circuits for performing mathematical operations on individual detector segment outputs

G11B7/0945

Methods for initialising servos, start-up sequences

G11B7/0946

specially adapted for operation during external perturbations not related to the carrier or servo beam, e.g. vibration

G11B7/0948

specially adapted for detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts G11B7/095 takes precedence

G11B7/095

specially adapted for discs, e.g. for compensation of eccentricity or wobble

G11B7/0953

to compensate for eccentricity of the disc or disc tracks

G11B7/0956

to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc

G11B7/10

Interchangeable mountings, e.g. for replacement of head without readjustment

including interchangeable electrical adjuster boards

G11B7/12

Heads, e.g. forming of the optical beam spot or modulation of the optical beam disposition or mounting of head elements within housing or with provision for moving of light source, optical beam or detector, irrelevant to the transducing method G11B7/08

; modulating lasers H01S3/10; controlling the intensity, colour, phase, polarisation or direction of light beams arriving from an independent light source, e.g. switching gating or modulating G02F1/00

G11B7/121

Protecting the head, e.g. against dust or impact with the record carrier

G11B7/122

Flying-type heads, e.g. analogous to Winchester type in magnetic recording

G11B7/123

Integrated head arrangements, e.g. with source and detectors mounted on the same substrate

G11B7/124

the integrated head arrangements including waveguides

G11B7/1245

the waveguides including means for electro-optical or acousto-optical deflection

G11B7/125

Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices

Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces

G11B7/126

Circuits, methods or arrangements for laser control or stabilisation

G11B7/1263

Power control during transducing, e.g. by monitoring

G11B7/1267

Power calibration

G11B7/127

Lasers

Multiple laser arrays

lasers per se

H01S

G11B7/1275

Two or more lasers having different wavelengths

G11B7/128

Modulators G11B7/1245 takes precedence

G11B7/13

Optical detectors therefor

G11B7/131

Arrangement of detectors in a multiple array

G11B7/133

Shape of individual detector elements

G11B7/135

Means for guiding the beam from the source to the record carrier or from the record carrier to the detector

G11B7/1353

Diffractive elements, e.g. holograms or gratings

diffraction gratings per se G02B5/18; holograms per se G02B5/32; grating systems G02B27/44

G11B7/1356

Double or multiple prisms, i.e. having two or more prisms in cooperation

G11B7/1359

Single prisms

G11B7/1362

Mirrors

G11B7/1365

Separate or integrated refractive elements, e.g. wave plates

In this group, integrated combinations of a refractive element, such as a coating element or phase plate, with another element, such as a lens, are classified in this group and in other appropriate groups for the other element.

G11B7/1367

Stepped phase plates

G11B7/1369

Active plates, e.g. liquid crystal panels or electrostrictive elements

G11B7/1372

Lenses

G11B2007/13722

Fresnel lenses

G11B2007/13725

Catadioptric lenses, i.e. having at least one internal reflective surface

G11B2007/13727

Compound lenses, i.e. two or more lenses co-operating to perform a function, e.g. compound objective lens including a solid immersion lens, positive and negative lenses either bonded together or with adjustable spacing

G11B7/1374

Objective lenses

optical objectives per se

G02B9/00

G11B7/1376

Collimator lenses

collimators per se

G02B27/30

G11B7/1378

Separate aberration correction lenses

Cylindrical lenses to generate astigmatism

Beam expanders

G11B7/1381

Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops G11B7/1353 - G11B7/1369 take precedence

G11B7/1384

Fibre optics

G11B7/1387

using the near-field effect

G11B7/139

Numerical aperture control means

G11B7/1392

Means for controlling the beam wavefront, e.g. for correction of aberration

optical systems for aberration correction per se

G02B27/00

G11B7/13922

passive

G11B7/13925

active, e.g. controlled by electrical or mechanical means

G11B7/13927

during transducing, e.g. to correct for variation of the spherical aberration due to disc tilt or irregularities in the cover layer thickness

G11B7/1395

Beam splitters or combiners G11B7/1353, G11B7/1356 take precedence

; beam splitting or combining per se

G02B27/10

G11B7/1398

Means for shaping the cross-section of the beam, e.g. into circular or elliptical cross-section

G11B7/14

specially adapted to record on, or to reproduce from, more than one track simultaneously

G11B7/22

Apparatus or processes for the manufacture of optical heads, e.g. assembly

G11B7/24

Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the arrangement of information on the carrier G11B7/007

G11B2007/240004

characterised by the form of the carrier

G11B2007/240008

Cards

G11B2007/240012

intended for rotation

G11B2007/240017

Tapes

G11B2007/240021

Cylinders

G11B2007/240025

for storing optical interference patterns, e.g. holograms

G11B7/24003

Shapes of record carriers other than disc shape

G11B7/24006

Cylindrical or shaft-shaped

G11B7/24009

Tapes, long films or long sheets

G11B7/24012

Optical cards

G11B7/24015

Air-sandwiched discs

When classifying in this group, classification is also made in group G11B7/2403 if the subject matter disclosed in the context of an air-sandwiched disc is of more general application

G11B7/24018

Laminated discs G11B7/24015 takes precedence

When classifying in this group, classification is also made in group G11B7/2403 if the subject matter disclosed in the context of a laminated disc is of more general application

G11B7/24021

provided with a special shape or structure for centering or eccentricity prevention, e.g. alignment

G11B7/24024

Adhesion or bonding, e.g. specific adhesive layers

G11B7/24027

Layers

Shape, structure or physical properties thereof G11B7/24021, G11B7/24024 take precedence

G11B7/2403

Layers

Shape, structure or physical properties thereof

G11B7/24033

Electrode layers

G11B7/24035

Recording layers substrates also used as recording layers G11B7/24047

G11B7/24038

Multiple laminated recording layers

G11B7/24041

with different recording characteristics

G11B7/24044

for storing optical interference patterns, e.g. holograms

for storing data in three dimensions, e.g. volume storage G11B7/24038 takes precedence

G11B7/24047

Substrates

G11B7/2405

being also used as track layers of pre-formatted layers tracks or pits G11B7/2407

G11B7/24053

Protective topcoat layers lying opposite to the light entrance side, e.g. layers for preventing electrostatic charging

G11B7/24056

Light transmission layers lying on the light entrance side and being thinner than the substrate, e.g. specially adapted for Blu-ray® discs

G11B7/24059

specially adapted for near-field recording or reproduction

G11B7/24062

Reflective layers

G11B7/24065

Layers assisting in recording or reproduction below the optical diffraction limit, e.g. non-linear optical layers or structures cover layers for near-field media G11B7/24059

G11B7/24067

Combinations of two or more layers with specific interrelation

G11B7/2407

Tracks or pits

Shape, structure or physical properties thereof layout of tracks or pits used as the identification information G11B7/007

G11B7/24073

Tracks

G11B7/24076

Cross sectional shape in the radial direction of a disc, e.g. asymmetrical cross sectional shape

G11B7/24079

Width or depth G11B7/24076 takes precedence

G11B7/24082

Meandering

G11B7/24085

Pits

G11B7/24088

for storing more than two values, i.e. multi-valued recording for data or prepits

G11B7/24091

Combinations of pits and tracks with specific interrelation

G11B7/24094

Indication parts or information parts for identification

G11B7/24097

Structures for detection, control, recording operation or replay operation

Special shapes or structures for centering or eccentricity prevention within laminated discs G11B7/24021

Arrangements for testing, inspecting or evaluating

Containers, cartridges or cassettes

When classifying in this group, classification is also made in group G11B23/00 if the subject matter disclosed in the context of an optical record carrier is of more general application

G11B7/241

characterised by the selection of the material

G11B7/242

of recording layers

G11B7/243

comprising inorganic materials only, e.g. ablative layers

G11B2007/24302

Metals or metalloids

G11B2007/24304

group 2 or 12 elements (e.g. Be, Ca, Mg, Zn, Cd)

G11B2007/24306

transition metal elements of groups 3-10

G11B2007/24308

transition metal elements of group 11 (Cu, Ag, Au)

G11B2007/2431

group 13 elements (B, Al, Ga, In)

G11B2007/24312

group 14 elements (e.g. Si, Ge, Sn)

G11B2007/24314

group 15 elements (e.g. Sb, Bi)

G11B2007/24316

group 16 elements (i.e. chalcogenides, Se, Te)

G11B2007/24318

Non-metallic elements

G11B2007/2432

Oxygen

G11B2007/24322

Nitrogen

G11B2007/24324

Sulfur

G11B2007/24326

Halides (F, CI, Br...)

G11B2007/24328

Carbon

G11B7/2433

Metals or elements of groups 13, 14, 15 or 16 of the Periodic System, e.g. B, Si, Ge, As, Sb, Bi, Se or Te

G11B7/2437

Non-metallic elements

G11B7/244

comprising organic materials only

G11B2007/2445

containing an azulene compound

G11B7/245

containing a polymeric component

G11B7/246

containing dyes

G11B2007/24606

Azo- dyes

G11B2007/24612

two or more dyes in one layer

G11B2007/24618

two or more dyes in two or more different layers, e.g. one dye absorbing at 405 nm in layer one and a different dye absorbing at 650 nm in layer two

G11B2007/24624

fluorescent dyes

G11B7/2463

azulene

G11B7/2467

azo-dyes

G11B7/247

methine or polymethine dyes

G11B2007/24705

Cyanine

G11B2007/2471

Merocyanine

G11B2007/24715

Oxonol

G11B7/2472

cyanine

G11B7/2475

merocyanine

G11B7/2478

oxonol

G11B7/248

porphines

azaporphines, e.g. phthalocyanines

G11B7/249

containing organometallic compounds G11B7/246 takes precedence

G11B2007/24905

neutral

G11B2007/2491

as anion

G11B2007/24915

as cation

G11B7/2492

neutral compounds

G11B7/2495

as anions

G11B7/2498

as cations

G11B7/25

containing liquid crystals

G11B7/251

comprising inorganic materials dispersed in an organic matrix

G11B7/252

of layers other than recording layers

G11B7/253

of substrates

G11B2007/25301

comprising glass

G11B2007/25302

comprising metals

G11B2007/25303

comprising resins

G11B2007/25304

Polycarbonate [PC]

G11B2007/25305

Polyester, e.g. PET, PETG, PEN

G11B2007/25306

Polystyrene [PS]

G11B2007/25307

Polycycloolefines [COCs]

G11B2007/25308

Biodegradable polymers, cellulose included

G11B7/2531

comprising glass

G11B7/2532

comprising metals

G11B7/2533

comprising resins

G11B7/2534

polycarbonates [PC]

G11B7/2535

polyesters, e.g. PET, PETG or PEN

G11B7/2536

polystyrene [PS]

G11B7/2537

epoxy resins

G11B7/2538

polycycloolefins [PCO]

G11B7/2539

biodegradable polymers, e.g. cellulose

G11B7/254

of protective topcoat layers

G11B2007/25402

consisting essentially of organic resins

G11B2007/25405

comprising inorganic filler, e.g. particles, fibres

G11B2007/25408

consisting essentially of inorganic materials

G11B2007/25411

containing transition metal elements (Zn, Fe, Co, Ni, Pt)

G11B2007/25414

containing Group 13 elements (B, Al, Ga)

G11B2007/25417

containing Group 14 elements (C, Si, Ge, Sn)

G11B7/2542

consisting essentially of organic resins

G11B7/2545

containing inorganic fillers, e.g. particles or fibres

G11B7/2548

consisting essentially of inorganic materials

G11B7/256

of layers improving adhesion between layers

G11B7/257

of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers

G11B2007/25701

consisting essentially of organic materials

G11B2007/25703

Resins

G11B2007/25705

consisting essentially of inorganic materials

G11B2007/25706

containing transition metal elements (Zn, Fe, Co, Ni, Pt)

G11B2007/25708

containing group 13 elements (B, Al, Ga)

G11B2007/2571

containing group 14 elements except carbon (Si, Ge, Sn, Pb)

G11B2007/25711

containing carbon

G11B2007/25713

containing nitrogen

G11B2007/25715

containing oxygen

G11B2007/25716

containing sulfur

G11B2007/25718

containing halides (F, Cl, Br, l)

G11B7/2572

consisting essentially of organic materials

G11B7/2575

resins

G11B7/2578

consisting essentially of inorganic materials

G11B7/258

of reflective layers

G11B2007/2581

based on aluminium

G11B2007/2582

based on silver

G11B2007/2583

based on gold

G11B7/2585

based on aluminium

G11B7/259

based on silver

G11B7/2595

based on gold

G11B7/26

Apparatus or processes specially adapted for the manufacture of record carriers

G11B7/261

Preparing a master, e.g. exposing photoresist, electroforming

G11B7/263

Preparing and using a stamper, e.g. pressing or injection molding substrates production of optical record carriers, e.g. optical discs B29D17/005

G11B7/265

Apparatus for the mass production of optical record carriers, e.g. complete production stations, transport systems

G11B7/266

Sputtering or spin-coating layers sputtering in general C23C14/24; spin-coating in general B05D1/005

G11B7/268

Post-production operations, e.g. initialising phase-change recording layers, checking for defects investigating the presence of flaws or contamination in optical discs G01N21/9506

G11B7/28

Re-recording, i.e. transcribing information from one optical record carrier on to one or more similar or dissimilar record carriers

G11B9/00

Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00

Record carriers therefor G11B11/00 takes precedence

driving or moving of heads G11B21/02

G11B9/02

using ferroelectric record carriers

Record carriers therefor

G11B9/04

using record carriers having variable electric resistance

Record carriers therefor

G11B9/06

using record carriers having variable electrical capacitance

Record carriers therefor G11B9/02 takes precedence

G11B9/061

Record carriers characterised by their structure or form or by the selection of the material; Apparatus or processes specially adapted for the manufacture of record carriers processes involving a single technical art and for which provision exists elsewhere, see the relevant class, e.g. B05D, F16N, C08L

G11B9/062

characterised by the form, e.g. comprising mechanical protection elements

G11B9/063

characterised by the selection of the material

G11B9/065

Additional layers for lubrication, wear protection or elimination of electrostatic charges of the interface between record carrier and head G11B9/066, G11B9/067 and G11B9/068 take precedence

G11B9/066

Electrically conductive layers G11B9/068 takes precedence

G11B9/067

Dielectric layers; Processes for providing electrical conductivity to them G11B9/068 takes precedence

G11B9/068

Moulding resin compositions

G11B9/07

Heads for reproducing capacitive information

G11B9/075

using mechanical contact with record carrier, e.g. by stylus

G11B9/08

using electrostatic charge injection

Record carriers therefor

G11B9/10

using electron beam

Record carriers therefor G11B9/08 takes precedence

see provisional also G11B11/03

G11B9/12

using near-field interactions

Record carriers therefor

G11B9/14

using microscopic probe means

, i.e. recording or reproducing by means directly associated with the tip of a microscopic electrical probe as used in Scanning Tunneling Microscopy [STM] or Atomic Force Microscopy [AFM] for inducing physical or electrical perturbations in a recording medium; Record carriers or media specially adapted for such transducing of information marking using electrical current B41M5/20; measuring roughness or irregularity of surfaces G01B7/34; details of scanning-probe microscopes G01Q

G11B9/1409

Heads

G11B9/1418

Disposition or mounting of heads or record carriers G11B17/00 and G11B19/00 take precedence

G11B9/1427

with provision for moving the heads or record carriers relatively to each other or for access to indexed parts without effectively imparting a relative movement

G11B9/1436

with provision for moving the heads or record carriers relatively to each other

G11B9/1445

switching at least one head in operating function; Controlling the relative spacing to keep the head operative, e.g. for allowing a tunnel current flow

G11B9/1454

Positioning the head or record carrier into or out of operative position or across information tracks; Alignment of the head relative to the surface of the record carrier G11B9/1445 takes precedence

G11B9/1463

Record carriers for recording or reproduction involving the use of microscopic probe means

G11B9/1472

characterised by the form

G11B9/1481

Auxiliary features, e.g. reference or indexing surfaces

G11B9/149

characterised by the memorising material or structure

G11B11/00

Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00

Record carriers therefor

driving or moving of heads G11B3/02, G11B5/48, G11B7/08, G11B21/02

Groups G11B11/00 - G11B11/14 mainly cover:

combined systems or apparatus comprising both recording and reproducing using different methods;

record carriers therefor.

Reading only or recording only using mechanical, magnetic, optical or other methods is covered by groups G11B3/00 - G11B9/08

G11B11/002

using recording by perturbation of the physical or electrical structure

G11B11/005

with reproducing by using non-optical beam of radiation or particles, e.g. electrons, directly interacting with the memorised information G11B11/007 takes precedence

G11B11/007

with reproducing by means directly associated with the tip of a microscopic electrical probe as defined in G11B9/14 details of heads G11B9/1409; disposition or mounting of heads G11B9/1418

G11B11/03

using recording by deforming with non-mechanical means, e.g. laser, beam of particles

G11B11/002 takes precedence; see proviosional also G11B3/68 - G11B3/72

G11B11/05

with reproducing by capacitive means

G11B9/07 takes precedence

G11B11/06

with reproducing by mechanical sensing

G11B11/08

using recording by electric charge or by variation of electric resistance or capacitance

G11B11/002, G11B11/10 take precedence

G11B11/10

using recording by magnetic means

or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field

G11B11/105

using a beam of light or a magnetic field for recording

by change of magnetisation

and a beam of light for reproducing,

i.e. magneto-optical,

e.g. light-induced thermomagnetic recording,

spin magnetisation recording,

Kerr

or Faraday

effect reproducing

G11B11/10502

characterised by the transducing operation to be executed

G11B11/10504

Recording for shaping of magnetic domains G11B11/10528, for compensation of shift G11B11/1053

G11B11/10506

by modulating only the light beam of the transducer

G11B11/10508

by modulating only the magnetic field at the transducer

G11B11/1051

by modulating both the magnetic field and the light beam at the transducers

G11B11/10513

one of the light beam or the magnetic field being modulated by data and the other by a clock or frequency generator

G11B11/10515

Reproducing compensating pit shift G11B11/1053

G11B11/10517

Overwriting or erasing G11B11/10526 takes precedence

G11B11/10519

Direct overwriting, i.e. performing erasing and recording using the same transducing means

G11B11/10521

using a single light spot

G11B11/10523

Initialising

G11B11/10526

Bulk initialisation or erasing, e.g. at least one whole information track with a single action

G11B11/10528

Shaping of magnetic domains, e.g. form, dimensions

G11B11/1053

to compensate for the magnetic domain drift or time shift

G11B11/10532

Heads

G11B11/10534

for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording

G11B11/10536

using thermic beams, e.g. lasers

G11B11/10539

using electromagnetic beams, e.g. polarised light

G11B11/10541

for reproducing

G11B11/10543

using optical beam of radiation

G11B11/10545

interacting directly with the magnetisation on the record carrier

G11B11/10547

interacting with the magnetisation of an intermediate transfer element, e.g. magnetic film, included in the head

G11B11/1055

Disposition or mounting of transducers relative to record carriers

G11B11/10552

Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base for relative movement of transducers G11B11/10573

G11B11/10554

the transducers being disposed on the same side of the carrier flying heads G11B11/1058

G11B11/10556

with provision for moving or switching or masking the transducers in or out of their operative position

G11B11/10558

in view of the loading or unloading of the carrier

G11B11/1056

Switching or mechanically reversing the magnetic field generator

G11B11/10563

Access of indexed parts

G11B11/10565

Marks for track change, e.g. prepits, gray codes

G11B11/10567

Mechanically moving the transducers

G11B11/10569

Swing arm positioners

G11B11/10571

Sled type positioners

G11B11/10573

Control of relative positioning of the magnetic and optical transducers, e.g. to move simultaneously

G11B11/10576

with provision for moving the transducers for maintaining alignment or spacing relative to the carrier

G11B11/10578

Servo format, e.g. prepits, guide tracks, pilot signals

G11B11/1058

Flying heads

G11B11/10582

Record carriers characterised by the selection of the material or by the structure or form

G11B11/10584

characterised by the form, e.g. comprising mechanical protection elements

G11B11/10586

characterised by the selection of the material

G11B11/10589

Details

G11B11/10591

for improving write-in properties, e.g. Curie-point temperature

G11B11/10593

for improving read-out properties, e.g. polarisation of light

G11B11/10595

Control of operating function

G11B11/10597

Adaptations for transducing various formats on the same or different carriers

G11B11/11

using a beam,

e.g. of electrons or X-rays

other than a beam of light

or a magnetic field

for recording

G11B11/115

using a beam,

e.g. of electrons or X-rays

other than a beam of light for reproducing

G11B11/12

using recording by optical means G11B11/03 takes precedence

G11B11/10 takes precedence

G11B11/14

with reproducing by magnetic means

G11B11/16

using recording by mechanical cutting, deforming or pressing

G11B11/002 takes precedence

G11B11/18

with reproducing by optical means

G11B11/20

with reproducing by magnetic means

G11B11/22

with reproducing by capacitive means

see provisionally G11B9/06, G11B9/07; G11B11/05

G11B11/24

using recording by near-field interactions

G11B11/26

using microscopic probe means

, i.e. recording by means directly associated with the tip of a microscopic electrical probe as used in scanning tunneling microscopy [STM] or atomic force microscopy [AFM] for inducing physical or electrical perturbations in a recording medium marking using electrical current B41M5/20; measuring roughness or irregularity of surfaces G01B7/34; details of scanning-probe microscopes G01Q

G11B13/00

Recording simultaneously or selectively by methods covered by different main groups

among G11B3/00, G11B5/00, G11B7/00 and G11B9/00

Record carriers therefor

not otherwise provided for

Reproducing therefrom

not otherwise provided for G11B9/14, G11B11/002 take precedence; driving or moving of heads G11B3/02, G11B5/48, G11B7/08, G11B21/02

This group is limited to the combination of recording and reproducing on the same record carrier by more than one of the different method covered by groups G11B3/00, G11B5/00, G11B7/00 and G11B9/00

G11B13/02

magnetically and by styli

G11B13/04

magnetically

or by magnetisation

and optically

or by radiation, for changing or sensing optical properties

G11B13/045

combined recording by magnetic and optic means

G11B13/06

optically and by styli

G11B13/08

using near-field interactions or transducing means and at least one other method or means for recording or reproducing

G11B15/00

Driving, starting or stopping record carriers of filamentary or web form

Driving both such record carriers and heads

Guiding such record carriers or containers therefor

Control thereof

Control of operating function driving or guiding heads G11B3/00 - G11B7/00, G11B21/00

G11B15/005

Programmed access in sequence to indexed parts of tracks of operating tapes, by driving or guiding the tape access by driving of both record carrier and head G11B15/1816; see prov. also G11B15/602

G11B15/02

Control of operating function, e.g. switching from recording to reproducing

G11B15/023

remotely controlled

G11B15/026

by using processor, e.g. microcomputer

see provisional also G11B15/005

G11B15/03

by using counters

see prov. also G11B15/00, G11B27/00

G11B15/04

Preventing, inhibiting, or warning against accidental erasing or double recording G11B15/05 takes precedence

G11B15/05

by sensing features present on or derived from record carrier or container G11B15/16 takes precedence

see provisional also G11B15/02

G11B15/06

by sensing auxiliary features on record carriers or containers, e.g. to stop machine near the end of a tape

G11B15/07

on containers

see provisional also G11B15/06

G11B15/08

by photoelectric sensing G11B15/07 takes precedence

G11B15/087

by sensing recorded signals

see provisional also G11B15/06, G11B15/02, G11B27/00

G11B15/093

by sensing driving condition of record carrier, e.g. travel, tape tension

see provisional also G11B15/16, G11B15/22, G11B15/46

G11B15/10

Manually-operated control

Solenoid-operated control

G11B15/44 takes precedence

G11B15/103

electrically operated

G11B15/106

mechanically operated

G11B15/12

Masking of heads;

circuits for

Selecting or switching of heads between operative and inoperative functions

or between different operative functions or for selection between operative heads

Masking of beams, e.g. of light beams

track selection by moving the magnetic head G11B5/54

G11B15/125

conditioned by the operating function of the apparatus

G11B15/14

Masking or switching periodically, e.g. of rotating heads

G11B15/16

by sensing presence, absence or position of record carrier or container

G11B15/17

of container

see prov. also G11B15/16

G11B15/18

Driving

Starting

Stopping

Arrangements for control or regulation thereof

G11B15/56 takes precedence

G11B15/1808

Driving of both record carrier and head G11B15/467 takes precedence; mounting of head G11B5/52

G11B15/1816

Programmed access in sequence to indexed parts of operating tapes cooperating with rotating heads see provisional also G11B15/005

G11B15/1825

driving or moving the head in a direction which cuts across the direction of travel of the tape, e.g. for helicoïdal scanning

G11B15/1833

with head driven in a plane, cyclically around an axis, e.g. on headwheel construction of headwheel G11B5/53, G11B21/16; disposition of heads on headwheel G11B5/531, G11B21/02

G11B15/1841

with provision for information tracking by moving the transducing part of the head relative to the headwheel, in the direction of the scanning movement, e.g. for skew or time base correction in the direction which cuts across tracks, i.e. for track following G11B3/38, G11B5/588, G11B7/085, G11B21/08, G11B21/10; by controlling headwheel rotation G11B15/4733, by guiding the tape G11B15/602

G11B15/185

using signals recorded in tracks disposed in parallel with the scanning direction

G11B15/1858

using auxiliary signals, i.e. pilot signals

G11B15/1866

superimposed on the main signal track

G11B15/1875

adaptations for special effects or editing signal processing or indexing therefor G11B27/00

G11B15/1883

for record carriers inside containers

G11B15/1891

the record carrier being endless

G11B15/20

Moving record carrier backwards or forwards by finite amounts, i.e. backspacing, forward spacing

G11B15/22

Stopping means

G11B15/06 takes precedence;

slowing-down preparatory to stopping or speed-changing G11B15/48; speed-controlling by mechanical linkage G11B15/50

; inside container G11B23/04

G11B15/24

Drive disengaging means

G11B15/26

Driving record carriers by members acting directly or indirectly thereon

G11B15/44 takes precedence; driving features inside container, see G11B23/04 and subgroups

G11B15/28

through rollers driving by frictional contact with the record carrier, e.g. capstan

Multiple arrangements of capstans or drums coupled to means for controlling the speed of the drive

Multiple capstan systems alternately engageable with record carrier to provide reversal

G11B15/285

through pneumatic means

G11B15/29

through pinch-rollers

or tape rolls

G11B15/295 takes precedence

G11B15/295

with single capstan or drum simultaneously driving the record carrier at two separate points of an isolated part thereof, e.g. the capstan acting directly on the tape rollers

G11B15/30

through the means for supporting the record carrier, e.g. mandrel, turntable

G11B15/32

through the reels or cores on to which the record carrier is wound

G11B15/34

through non-slip drive means, e.g. sprocket

G11B15/38

Driving record carriers by pneumatic means

pneumatic control for capstans driving the record carrier by frictional contact G11B15/285

G11B15/385

directly, e.g. by rotating drum guiding record carrier on rotating drum G11B15/61

G11B15/40

Driving record carriers otherwise than by electric motor

G11B15/42

manually

G11B15/43

Control or regulation of mechanical tension of record carrier, e.g. tape tension

G11B15/44

Speed-changing arrangements

Reversing arrangements

Drive transfer means therefor

G11B15/442

Control thereof

G11B15/444

reversing arrangements G11B15/442 takes precedence

G11B15/446

by driving the reels only

G11B15/448

automatic reverse drive transfer therefor

G11B15/46

Controlling, regulating, or indicating speed

dependent on position of tape in reserve, loop G11B15/56, G11B15/58

G11B15/463

by using pilot tracking tones embedded in binary coded signals, e.g. using DSV/CDS values of coded signals

G11B15/467

in arrangements for recording or reproducing wherein both record carriers and heads are driven

see provisional also G11B15/1808

G11B15/4671

by controlling simultaneously the speed of the tape and the speed of the rotating head

G11B15/4672

with provision for information tracking

G11B15/4673

by controlling the speed of the tape while the head is rotating

G11B15/4675

with provision for information tracking

G11B15/4676

using signals recorded in tracks disposed in parallel with the scanning direction

G11B15/4677

using auxiliary signals, i.e. pilot signals

G11B15/4678

superimposed on the main signal track

G11B15/473

by controlling the speed of the heads

see prov. also G11B5/588

G11B15/4731

control of headwheel rotation disposition or construction of headwheel motor G11B5/53, G11B21/02

G11B15/4733

with provision for information tracking, e.g. for time base correction

G11B15/4735

using signals recorded in tracks disposed parallel with the scanning direction

G11B15/4736

using auxiliary signals, i.e. pilot signals

G11B15/4738

superimposed on the main signal track

G11B15/48

Starting

Accelerating

Decelerating

Arrangements preventing malfunction during drive change

G11B15/50

by mechanical linkage, e.g. clutch

G11B15/52

by using signals recorded on, or derived from, record carrier

G11B15/54

by stroboscope

by tachometer

G11B15/56

the record carrier having reserve loop, e.g. to minimise inertia during acceleration

measuring or control in connection therewith

G11B15/58

with vacuum column

G11B15/60

Guiding record carrier guiding devices structurally associated with magazines or cassettes G11B23/04

G11B15/602

for track selection, acquisition or following

G11B15/605

without displacing the guiding means

G11B15/607

Pneumatic guiding

G11B15/61

on drum, e.g. drum containing rotating heads

G11B15/66 takes precedence

G11B15/615

inside container

G11B15/62

Maintaining desired spacing between record carrier and head

G11B15/64

by fluid-dynamic spacing

G11B15/66

Threading

Automatic self-loading

G11B15/662

Positioning or locking of spool or reel

G11B15/665

by extracting loop of record carrier from container

G11B15/6651

to pull the record carrier against non rotating heads

G11B15/6653

to pull the record carrier against drum

G11B15/6655

using one loading ring, i.e. "C-type" G11B15/6658 takes precedence

G11B15/6656

using two-sided extraction, i.e. "M-type"

G11B15/6658

with two loading rings rotating in opposite directions

G11B15/67

by extracting end of record carrier from container or spool

G11B15/671

using pneumatic means

G11B15/672

Extracting end of record carrier from container or single reel G11B15/671 takes precedence

G11B15/673

Threading end of record carrier externally to single reel G11B15/671 takes precedence

G11B15/674

Threading or attaching end of record carrier on or to single reel G11B15/671 takes precedence

G11B15/675

Guiding containers

, e.g. loading, ejecting cassettes

G11B15/67502

Details

G11B15/67505

Servo control

G11B15/67507

Ejection damping means

G11B15/6751

with movement of the cassette parallel to its main side, i.e. front loading G11B15/67544 takes precedence

G11B15/67513

and movement of driving elements perpendicular thereto

G11B15/67515

with servo control

G11B15/67518

with ejection damping means

G11B15/67521

of cassette with internal belt drive

G11B15/67523

with servo control

G11B15/67526

with ejection damping means

G11B15/67528

of endless tape cassette

G11B15/67531

with servo control

G11B15/67534

with ejection damping means

G11B15/67536

of cassette inside drawer

G11B15/67539

with servo control

G11B15/67542

with ejection damping means

G11B15/67544

with movement of the cassette parallel to its main side and subsequent movement perpendicular thereto, i.e. front loading

G11B15/67547

the two movements being made by the cassette holder

G11B15/67549

with servo control

G11B15/67552

with ejection damping means

G11B15/67555

the second movement only being made by the cassette holder

G11B15/67557

with servo control

G11B15/6756

with ejection damping means

G11B15/67563

with movement of the cassette perpendicular to its main side, i.e. top loading

G11B15/67565

of the cassette with holder

G11B15/67568

with servo control

G11B15/67571

with ejection damping means

G11B15/67573

of the cassette without holder

G11B15/67576

with servo control

G11B15/67578

with ejection damping means

G11B15/67581

with pivoting movement of the cassette holder

G11B15/67584

outside the apparatus

G11B15/67586

with servo control

G11B15/67589

with ejection damping means

G11B15/67592

inside the apparatus

G11B15/67594

with servo control

G11B15/67597

with ejection damping means

G11B15/68

Automatic cassette changing arrangements;

automatic tape changing arrangements

G11B15/6805

with linearly moving rectangular box shaped magazines

G11B15/681

in vertical direction

G11B15/6815

in horizontal direction

G11B15/682

with fixed magazines having fixed cassette storage cells, e.g. in racks

G11B15/6825

Details of magazines, e.g. removable, adapted for cassettes of different sizes

G11B15/683

wherein the recorder or player is moved according to the location of a selected cassette G11B15/684 takes precedence

G11B15/6835

the cassettes being transferred to a fixed recorder or player using a moving carriage

G11B15/684

the cassettes having a storage position inside the magazine and a slightly shifted active position, e.g. by solenoid

G11B15/6845

with rotatable magazine

G11B15/685

the cassettes being arranged in a single level

G11B15/6855

wherein the recorder or player is moved towards a selected cassette in the magazine

G11B15/686

with a fixed recorder or player in the centre or at the periphery of the magazine

G11B15/6865

with a fixed recorder or player under the magazine

G11B15/687

the cassettes being arranged in multiple levels

G11B15/6875

wherein the recorder or player is moved towards a selected cassette in the magazine

G11B15/688

the cassettes being transferred to a fixed recorder or player using a moving carriage

G11B15/6885

the cassettes being conveyed within a cassette storage location, e.g. within a storage bin or conveying by belt

G11B15/689

Control of the cassette changing arrangement

G11B15/6895

Automatic tape changing arrangements

G11B15/70

the record carrier being an endless loop record carrier

inside container G11B15/1891

G11B17/00

Guiding record carriers not specifically of filamentary or web form, or of supports therefor guiding cards or sheets G06K13/00

G11B17/005

Programmed access to indexed parts of tracks of operating discs, by guiding the disc

G11B17/02

Details

G11B17/021

Selecting or spacing of record carriers for introducing the heads

G11B17/022

Positioning or locking of single discs

G11B17/025

of discs which are stationary during transducing operation

G11B17/0255

flexible discs

G11B17/028

of discs rotating during transducing operation

G11B17/0281

by an adapter enabling the centre-pin to receive carriers with large centre hole

G11B17/0282

by means provided on the turntable

G11B17/0283

Two or more turntables

G11B17/0284

by clampers

G11B17/0285

mounted on a bridge

G11B17/0286

mounted on a pivotal lever

G11B17/0287

by permanent connections, e.g. screws, rivets

G11B17/0288

by means for moving the turntable or the clamper towards the disk

G11B17/03

in containers or trays

G11B17/032, G11B17/035 take precedence

G11B17/032

Positioning by moving the door or the cover

G11B17/035 takes precedence

G11B17/035

Positioning by moving the loading station

G11B17/038

Centering or locking of a plurality of discs in a single cartridge

G11B17/04

Feeding or guiding single record carrier to or from transducer unit

guiding during transducing operation G11B17/34

G11B17/0401

Details

G11B17/0402

Servo control

G11B17/0404

with parallel drive rollers

G11B17/0405

Closing mechanism, e.g. door

G11B17/0407

controlling the loading of the record carrier

G11B17/0408

of non-disc record carrier, e.g. card

G11B17/041

specially adapted for discs contained within cartridges

G11B17/043

Direct insertion, i.e. without external loading means

G11B17/0432

adapted for discs of different sizes

G11B17/0434

with mechanism for subsequent vertical movement of the disc G11B17/0438 takes precedence

G11B17/0436

with opening mechanism of the cartridge shutter G11B17/0438 takes precedence

G11B17/0438

with mechanism for subsequent vertical movement of the disc and opening mechanism of the cartridge shutter

G11B17/044

Indirect insertion, i.e. with external loading means

G11B17/046

with pivoting loading means

G11B17/0463

adapted for discs of different sizes

G11B17/0466

with opening mechanism of the cartridge shutter

G11B17/047

with sliding loading means

G11B17/0473

adapted for discs of different sizes

G11B17/0476

with opening mechanism of the cartridge shutter

G11B17/049

Insertion of discs having to be extracted from the cartridge prior to recording or reproducing

G11B17/05

specially adapted for discs not contained within cartridges

G11B17/051

Direct insertion, i.e. without external loading means

G11B17/0515

adapted for discs of different sizes

G11B17/053

Indirect insertion, i.e. with external loading means

G11B17/054

with pivoting loading means

G11B17/0545

adapted for discs of different sizes

G11B17/056

with sliding loading means

G11B17/0565

adapted for discs of different sizes

G11B17/057

specially adapted for handling both discs contained within cartridges and discs not contained within cartridges

G11B17/08

from consecutive-access magazine of disc records

G11B17/10

with horizontal transfer to the turntable from a stack arranged with a vertical axis

G11B17/12

with axial transfer to the turntable from a stack with a vertical axis

G11B17/14

by mechanism in rotating centre post, e.g. permitting the playing of both sides of a record

G11B17/16

by mechanism in stationary centre post, e.g. with stepped post, using fingers on post

G11B17/162

with means for detecting the diameter of the record

G11B17/165

with mechanical detecting means

G11B17/167

with optical detecting means

G11B17/18

by mechanism operating on the edge of the disc record

G11B17/20

with transfer away from stack on turntable after playing

G11B17/22

from random access magazine of disc records

G11B17/221

with movable magazine G11B17/24 - G11B17/28 take precedence

G11B17/223

in a vertical direction

G11B17/225

wherein the disks are transferred from a fixed magazine to a fixed playing unit using a moving carriage

G11B17/226

the magazine consisting of a single rotatable tray carrying the disks

G11B17/228

Control systems for magazines G11B17/225 takes precedence

G11B17/24

the magazine having a toroidal or part-toroidal shape

Group G11B17/30 takes precedence over groups G11B17/24 - G11B17/28.

G11B17/26

the magazine having a cylindrical shape with vertical axis

G11B17/28

the magazine having a cylindrical shape with horizontal axis

G11B17/30

wherein the playing unit is moved according to the location of the selected record

G11B17/32

Maintaining desired spacing between record carrier and head, e.g. by fluid-dynamic spacing

damping of vibrations of record carriers on turntables by fluid-dynamic means G11B19/2018

G11B17/34

Guiding record carriers during transducing operation, e.g. for track following G11B17/32 takes precedence

G11B19/00

Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor

Control thereof

Control of operating function

; Driving both disc and head

G11B19/02

Control of operating function, e.g. switching from recording to reproducing

G11B19/022

Control panels

G11B19/025

'Virtual' control panels, e.g. Graphical User Interface [GUI]

G11B19/027

Remotely controlled remote control systems in general G08C

G11B19/04

Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions

G11B19/041

Detection or prevention of read or write errors

G11B19/042

due to external shock or vibration

G11B19/043

by detecting a free-fall condition

G11B19/044

by using a data buffer

G11B19/045

by detecting mistracking

G11B19/046

Detection or prevention or problems due to temperature

G11B19/047

Recovery from power failure

G11B19/048

Testing of disk drives, e.g. to detect defects or prevent sudden failure

G11B19/06

by counting or timing of machine operations

G11B19/08

by using devices external to the driving mechanisms, e.g. coin-freed switch coin actuated mechanisms G07F5/00

G11B19/10

by sensing presence or absence of record in accessible stored position or on turntable

G11B19/12

by sensing distinguishing features of

or on

records, e.g. diameter

end mark

G11B2019/121

by photo-electric sensing

G11B19/122

involving the detection of an identification or authentication mark record carriers indicating unauthorised or prior use G11B23/28

G11B19/124

involving the detection of diameter of disks feeding or guiding of a single record carrier G11B17/04 and subgroups

G11B19/125

involving the detection of carrier data format

G11B19/127

involving detection of the number of sides, e.g. single or double, or layers, e.g. for multiple recording or reproducing layers

G11B19/128

involving the detection of track pitch or recording density

G11B19/14

by sensing movement or position of head, e.g. means moving in correspondence with head movements

G11B19/16

Manual control

G11B19/165

by closing the cover

G11B19/18

Manual action on one element producing control effect indirectly by consequent action of driving mechanism

G11B19/20

Driving

Starting

Stopping

Control thereof

G11B19/2009

Turntables, hubs and motors for disk drives; Mounting of motors in the drive means for clamping of disk to turntable G11B17/022 and subgroups

G11B19/2018

Incorporating means for passive damping of vibration, either in the turntable, motor or mounting

G11B19/2027

Turntables or rotors incorporating balancing means; Means for detecting imbalance

G11B19/2036

Motors characterized by fluid-dynamic bearings

G11B19/2045

Hubs

G11B19/2054

Spindle motor power-up sequences

G11B19/2063

Spindle motor power-down sequences

G11B19/2072

for the reduction of power consumption during idle time

G11B19/2081

emergency power-down

G11B19/209

in multiple disk arrays, e.g. spindle synchronisation in RAID systems

G11B19/22

Brakes other than speed-regulating brakes

G11B19/24

Arrangements for providing constant relative speed between record carrier and head

G11B19/247

using electrical means

G11B19/253

using mechanical means

G11B19/26

Speed-changing arrangements

Reversing arrangements

Drive-transfer means therefor

G11B19/265

Friction wheel drive

G11B19/27

Belt drive

G11B19/275

Gear wheel drive

G11B19/28

Speed controlling, regulating, or indicating G11B19/24 takes precedence

G11B20/00

Signal processing not specific to the method of recording or reproducing

Circuits therefor

G11B20/00007

Time or data compression or expansion audio compression based on psychoacoustics G10L19/00; data processing for reproducing audio data at different playback speeds G10L21/04; video compression H04N19/00; data compression per se

H03M7/30

G11B2020/00014

the compressed signal being an audio signal

G11B2020/00021

lossless audio compression

G11B2020/00028

Advanced audio coding [AAC]

G11B2020/00036

AC-3, i.e. ATSC digital audio compression standard

G11B2020/00043

Adaptive transform acoustic coding [ATRAC]

G11B2020/0005

DTS audio codecs

G11B2020/00057

MPEG-1 or MPEG-2 audio layer III [MP3]

G11B2020/00065

Sigma-delta audio encoding

G11B2020/00072

the compressed signal including a video signal

G11B2020/00079

the compression ratio or quality level being adapted to circumstances, e.g. to the available recording space

G11B20/00086

Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00

G11B20/00094

involving measures which result in a restriction to authorised record carriers

G11B20/00101

the original record carrier having a larger recording capacity than the potential target medium

G11B20/00108

wherein original, non-rewritable record carriers are recognised by trying to erase recorded data

G11B20/00115

wherein the record carrier stores a unique medium identifier

G11B20/00123

the record carrier being identified by recognising some of its unique characteristics, e.g. a unique defect pattern serving as a physical signature of the record carrier

G11B20/0013

wherein the measure concerns not the entire record carrier, but a specific physical or logical area of one or more record carriers

G11B20/00137

involving measures which result in a restriction to contents recorded on or reproduced from a record carrier to authorised users

G11B20/00144

involving a user identifier, e.g. a unique customer ID

G11B20/00152

involving a password

G11B20/00159

Parental control systems

G11B20/00166

involving measures which result in a restriction to authorised contents recorded on or reproduced from a record carrier, e.g. music or software

G11B20/00173

wherein the origin of the content is checked, e.g. determining whether the content has originally been retrieved from a legal disc copy or another trusted source

G11B20/00181

using a content identifier, e.g. an international standard recording code [ISRC] or a digital object identifier [DOI]

G11B20/00188

involving measures which result in a restriction to authorised devices recording or reproducing contents to/from a record carrier

G11B20/00195

using a device identifier associated with the player or recorder, e.g. serial numbers of playback apparatuses or MAC addresses

G11B20/00202

wherein the copy protection scheme builds on multi-session recording, e.g. defective table of contents [TOC] in the 2nd session

G11B20/0021

involving encryption or decryption of contents recorded on or reproduced from a record carrier

G11B20/00217

the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source key distribution or management H04L9/08

G11B20/00224

wherein the key is obtained from a remote server

G11B20/00231

wherein the key is obtained from a local external medium, e.g. a card

G11B20/00239

wherein the key is provided by a software application accessing the medium

G11B20/00246

wherein the key is obtained from a local device, e.g. device key initially stored by the player or by the recorder

G11B20/00253

wherein the key is stored on the record carrier

G11B20/0026

the key being stored as a barcode

G11B20/00268

said barcode being recorded in a burst cutting area [BCA]

G11B20/00275

the key being stored on a chip attached to the record carrier

G11B20/00282

the key being stored in the content area, e.g. program area, data area or user area key stored in a management area G11B20/00297

G11B20/00289

wherein the key is stored as a watermark

G11B20/00297

the key being stored in a management area, e.g. the video manager [VMG] of a DVD

G11B20/00304

the key being stored in the lead-in area [LIA]

G11B20/00311

the key being stored in the lead-out area [LOA]

G11B20/00318

the key being stored in the TOC

G11B20/00326

the key being embossed on the record carrier

G11B20/00333

the key being stored in header data, e.g. in sector headers

G11B20/0034

the key being stored as a hologram

G11B20/00347

wherein the medium identifier is used as a key

G11B20/00355

the record carrier having a label that provides the key

G11B20/00362

the key being obtained from a media key block [MKB]

G11B20/00369

wherein a first key, which is usually stored on a hidden channel, e.g. in the lead-in of a BD-R, unlocks a key locker containing a second

G11B20/00376

the key being stored by varying the pit format, e.g. depth, width, length or edge positions

G11B20/00384

the key being derived from a physical signature of the record carrier, e.g. unique feature set

G11B20/00391

the key being stored in subcodes, e.g. in the Q subcode of a CD

G11B20/00398

the key being stored in sync patterns

G11B20/00405

the key being stored by varying characteristics of the recording track, e.g. by altering the track pitch or by modulating the wobble track

G11B20/00413

wherein the key is input by a user

G11B20/0042

the copy protection scheme being related to a specific access protection standard

G11B20/00427

advanced access content system [AACS]

G11B20/00434

content protection for pre-recorded media [CPPM]

G11B20/00442

content protection for recordable media [CPRM]

G11B20/00449

content scrambling system [CSS]

G11B20/00456

digital transmission content protection [DTCP]

G11B20/00463

high-bandwidth digital content protection [HDCP]

G11B20/00471

video content protection system [VCPS]

G11B20/00478

wherein contents are decrypted and re-encrypted with a different key when being copied from/to a record carrier

G11B20/00485

characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier

G11B20/00492

wherein content or user data is encrypted

G11B20/005

wherein only some specific parts of the content are encrypted, e.g. encryption limited to I-frames

G11B20/00507

wherein consecutive physical data units of the record carrier are encrypted with separate encryption keys, e.g. the key changes on a cluster or sector basis

G11B20/00514

wherein the entire content is encrypted with the same key, e.g. disc key or master key

G11B20/00521

wherein each session of a multisession recording medium is encrypted with a separate encryption key

G11B20/00528

wherein each title is encrypted with a separate encryption key for each title, e.g. title key for movie, song or data file

G11B20/00536

wherein encrypted content data is subjected to a further, iterated encryption, e.g. interwoven encryption

G11B20/00543

wherein external data is encrypted, e.g. for secure communication with an external device or for encrypting content on a separate record carrier

G11B20/0055

wherein license data is encrypted

G11B20/00557

wherein further management data is encrypted, e.g. sector headers, TOC or the lead-in or lead-out areas

G11B20/00565

wherein parity data is encrypted

G11B20/00572

involving measures which change the format of the recording medium

G11B20/00579

said format change concerning the data encoding, e.g., modulation schemes violating run-length constraints, causing excessive DC content, or involving uncommon codewords or sync patterns

G11B20/00586

said format change concerning the physical format of the recording medium

G11B20/00594

wherein the shape of recording marks is altered, e.g. the depth, width, or length of pits

G11B20/00601

wherein properties of tracks are altered, e.g., by changing the wobble pattern or the track pitch, or by adding interruptions or eccentricity

G11B20/00608

wherein the material that the record carrier is made of is altered, e.g. adding reactive dyes that alter the optical properties of a disc after prolonged exposure to light or air

G11B20/00615

said format change concerning the logical format of the recording medium, e.g. the structure of sectors, blocks, or frames

G11B20/00623

wherein the modification to the logical format directly concerns user data

G11B20/0063

wherein the modification to the logical format mainly concerns management data, e.g., by changing the format of the TOC or the subcode

G11B20/00637

said management data being address data

G11B20/00644

the address data format being such that there are overlapping address ranges

G11B20/00652

the address data being scrambled so that ascending address values do not reflect the physical order of data blocks

G11B20/00659

involving a control step which is implemented as an executable file stored on the record carrier

G11B20/00666

involving a step of erasing or nullifying data, e.g. data being overwritten with a random string

G11B20/00673

wherein the erased or nullified data include a cryptographic key

G11B20/00681

involving measures which prevent a specific kind of data access

G11B20/00688

said measures preventing that a usable copy of recorded data can be made on another medium

G11B20/00695

said measures preventing that data are read from the recording medium

G11B20/00702

said measures preventing that data are recorded on the recording medium

G11B20/0071

involving a purchase action

G11B20/00717

wherein accounting and payment are postponed, e.g. until the player can establish a network connection to the service provider

G11B20/00724

wherein a prepaid credit balance is registered on the recording medium

G11B20/00731

involving a digital rights management system for enforcing a usage restriction

G11B20/00739

wherein the usage restriction is associated with a specific geographical region

G11B20/00746

wherein the usage restriction can be expressed as a specific number

G11B20/00753

wherein the usage restriction limits the number of copies that can be made, e.g. CGMS, SCMS, or CCI flags

G11B20/0076

wherein the copy frequency, i.e. the number of copies in a given time period, is limited

G11B20/00768

wherein copy control information is used, e.g. for indicating whether a content may be copied freely, no more, once, or never, by setting CGMS, SCMS, or CCI flags

G11B20/00775

wherein said copy control information is encoded in an encryption mode indicator [EMI]

G11B20/00782

wherein the usage restriction limits the number of times a program can be installed

G11B20/00789

wherein the usage restriction limits the number of functional copies, which can be accessed at a time, e.g. electronic bookshelf concept, virtual library, video rentals or check-in/check out

G11B20/00797

wherein the usage restriction limits the number of times a content can be reproduced, e.g. using playback counters

G11B20/00804

wherein the usage restriction limits the number of users or devices that are allowed to access a given content

G11B20/00811

wherein said number is encoded as a cryptographic token or ticket

G11B20/00818

wherein the usage restriction limits the signal quality, e.g. by low-pass filtering of audio signals or by reducing the resolution of video signals

G11B20/00826

wherein a spoiler signal is added to degrade the signal quality

G11B20/00833

wherein the usage restriction limits the data access speed, e.g. by defining a maximum bit rate of the I/O interface

G11B20/0084

wherein the usage restriction can be expressed as a specific time or date

G11B20/00847

wherein the usage restriction is defined by a licence file

G11B20/00855

involving a step of exchanging information with a remote server

G11B20/00862

wherein the remote server can grant the permission to use a content

G11B20/00869

wherein the remote server can deliver the content to a receiving device

G11B20/00876

wherein physical copy protection means are attached to the medium, e.g. holograms, sensors, or additional semiconductor circuitry

G11B20/00884

involving a watermark, i.e. a barely perceptible transformation of the original data which can nevertheless be recognised by an algorithm

G11B20/00891

embedded in audio data

G11B20/00898

based on a hash function

G11B20/00905

multiple watermarks used in combination

G11B20/00913

based on a spread spectrum technique

G11B20/0092

involving measures which are linked to media defects or read/write errors

G11B20/00927

wherein said defects or errors are generated on purpose, e.g. intended scratches

G11B20/00934

said intentional errors occurring because of corrupted address information

G11B20/00942

said intentional errors occurring due to an invalid playback path or program chain

G11B20/00949

said intentional errors occurring due to bad sectors, which are either physically destroyed or which are declared defective in the defect management information

G11B20/00956

said intentional errors occurring due to an invalid TOC

G11B20/00963

wherein said defects or errors are not generated on purpose, e.g. random defect patterns occurring during the normal manufacture

G11B20/00971

involving measures for monitoring the industrial media production and distribution channels, e.g. for controlling content providers or the official manufacturers or replicators of recording media

G11B20/00978

wherein the record carrier stores a trial version of a content

G11B20/00985

the trial version being of lower quality than the original version

G11B20/00992

Circuits for stereophonic or quadraphonic recording or reproducing

G11B20/02

Analogue recording or reproducing

G11B20/025

Error detection or correction

G11B20/04

Direct recording or reproducing

G11B20/06

Angle-modulation recording or reproducing

G11B20/08

Pulse-modulation recording or reproducing pulse-code-modulation recording G11B20/10

G11B20/10

Digital recording or reproducing

G11B20/10009

Improvement or modification of read or write signals

G11B20/10018

analog processing for digital recording or reproduction G11B20/10037 - G11B20/10481 take precedence

G11B20/10027

adjusting the signal strength during recording or reproduction, e.g. variable gain amplifiers optimum power control for optical discs G11B7/125

G11B20/10037

A/D conversion, D/A conversion, sampling, slicing and digital quantisation or adjusting parameters thereof

G11B20/10046

filtering or equalising, e.g. setting the tap weights of an FIR filter

G11B20/10055

using partial response filtering when writing the signal to the medium or reading it therefrom

G11B20/10064

EEPR4 or E2PR4, i.e. extended partial response class 4, polynomial (1-D)*(1+D)³

G11B20/10074

EPR4, i.e. extended partial response class 4, polynomial (1-D) *(1+D)²

G11B20/10083

PR1 or PR(1,1,), i.e. partial response class 1, polynomial 1+D

G11B20/10092

partial response PR(1,1,1,1)

G11B20/10101

PR2 or PR(1,2,1), i.e. partial response class 2, polynomial (1+D)2=1+2D+D2

G11B20/10111

partial response PR(1,2,2,1)

G11B20/1012

partial response PR(1,2,2,2,1)

G11B20/10129

partial response PR(1,2,3,3,2,1)

G11B20/10138

partial response PR (2,3,3,2)

G11B20/10148

partial response PR(1,3,3,1)

G11B20/10157

PR3 or PR(2,1,-1), i.e. partial response class 3, polynomial (1+D)(2-D)=2+D-D2

G11B20/10166

partial response PR(3,4,4,3)

G11B20/10175

PR4, PR(1,0,-1), i.e. partial response class 4, polynomial (1+D)(1-D)=(1-D2)

G11B20/10185

PR5 or PR(-1,0,2,0,-1), i.e. partial response class 5, polynomial -((1+D)2) *((1-D)2) =-1+2D2-D4

G11B20/10194

using predistortion during writing G11B20/10055 takes precedence

G11B20/10203

baseline correction DC correction by choosing codewords of the modulation code G11B20/1426

G11B20/10212

compensation for data shift, e.g. pulse-crowding effects

G11B20/10222

clock-related aspects, e.g. phase or frequency adjustment or bit synchronisation dedicated sync patterns in the modulation code G11B20/1403

G11B20/10231

wherein an asynchronous, free-running clock is used; Interpolation of sampled signals

G11B20/1024

wherein a phase-locked loop [PLL] is used

G11B20/1025

the PLL being discrete time or digital PLL

G11B20/10259

simultaneous timing recovery for multiple parallel tracks

G11B20/10268

bit detection or demodulation methods

G11B20/10277

the demodulation process being specifically adapted to partial response channels, e.g. PRML decoding

G11B20/10287

using probabilistic methods, e.g. maximum likelihood detectors G11B20/10277 takes precedence

G11B20/10296

using the Viterbi algorithm

G11B20/10305

signal quality assessment

G11B20/10314

amplitude of the recorded or reproduced signal

G11B20/10324

asymmetry of the recorded or reproduced waveform

G11B20/10333

wherein the asymmetry is linked to domain bloom

G11B20/10342

sub-information or auxiliary signals different from the normal recording marks, e.g. signals reproduced from wobble tracks

G11B20/10351

baseline shift, DC content, bias

G11B20/10361

digital demodulation process

G11B20/1037

based on hard decisions, e.g. by evaluating bit error rates before or after ECC decoding

G11B20/10379

based on soft decisions, e.g. confidence values, probability estimates, likelihoods values or path metrics of a statistical decoding algorithm

G11B20/10388

control of the read or write heads, e.g. tracking errors, defocus or tilt compensation

G11B20/10398

jitter, timing deviations or phase and frequency errors

G11B20/10407

by verifying the timing of signal transitions, e.g. rising or falling edges, or by analysing signal slopes

G11B20/10416

by verifying the timing of peak values

G11B20/10425

by counting out-of-lock events of a PLL

G11B20/10435

by verifying the timing of predetermined signal patterns, e.g. sync patterns

G11B20/10444

by verifying the timing of zero crossings

G11B20/10453

physical shape of recording marks, e.g. their length, width, depth or contour

G11B20/10462

consistency with a reference waveform in a given time period, e.g. by calculating correlations or mean square errors

G11B20/10472

derived from statistics of other quality measures, e.g. their mean, variance or skew

G11B20/10481

optimisation methods

G11B20/1049

using closed-form solutions

G11B20/105

selecting parameter values from a plurality of predetermined settings

G11B20/10509

iterative methods, e.g. trial-and-error, interval search, gradient descent or feedback loops G11B20/10518 takes precedence

G11B20/10518

using neural networks

G11B20/10527

Audio or video recording; Data buffering arrangements G11B20/12 - G11B20/18 take precedence

G11B2020/10537

Audio or video recording

G11B2020/10546

specifically adapted for audio data

G11B2020/10555

wherein the frequency, the amplitude, or other characteristics of the audio signal is taken into account

G11B2020/10564

frequency

G11B2020/10574

volume or amplitude

G11B2020/10583

parameters controlling audio interpolation processes

G11B2020/10592

specifically adapted for recording or reproducing multichannel signals

G11B2020/10601

surround sound signal

G11B2020/10611

3D video data

G11B2020/1062

Data buffering arrangements, e.g. recording or playback buffers

G11B2020/10629

the buffer having a specific structure

G11B2020/10638

First-in-first-out memories [FIFO] buffers

G11B2020/10648

First-in-last-out memories [LIFO] buffers

G11B2020/10657

Cache memories for random data access, e.g. buffers wherein the data output is controlled by a priority parameter other than retention time

G11B2020/10666

Ring buffers, e.g. buffers wherein an iteratively progressing read or write pointer moves back to the beginning of the buffer when reaching the last storage cell

G11B2020/10675

aspects of buffer control

G11B2020/10685

input interface, i.e. the way data enter the buffer, e.g. by informing the sender that the buffer is busy

G11B2020/10694

output interface, i.e. the way data leave the buffer, e.g. by adjusting the clock rate

G11B2020/10703

processing rate of the buffer, e.g. by accelerating the data output

G11B2020/10712

buffer capacity, e.g. when the buffer capacity is exhausted, buffered data are overwritten with more recent data, accepting that the old data are lost

G11B2020/10722

wherein the size of the buffer is variable, e.g. by adding additional memory cells for coping with input streams that have high bit rates

G11B2020/10731

wherein the buffer I/O can be temporarily suspended, e.g. by refusing to accept further data to be buffered

G11B2020/1074

involving a specific threshold value

G11B2020/1075

the usage of the buffer being restricted to a specific kind of data

G11B2020/10759

content data

G11B2020/10768

by pre-caching the initial portion of songs or other recorded or downloaded data for starting playback instantly

G11B2020/10777

instructions or commands

G11B2020/10787

parameters, e.g. for decoding or encoding

G11B2020/10796

address data

G11B2020/10805

involving specific measures to prevent a buffer overflow

G11B2020/10814

involving specific measures to prevent a buffer underrun

G11B2020/10824

the buffer being used to prevent vibrations or shocks from causing delays

G11B2020/10833

Copying or moving data from one record carrier to another

G11B2020/10842

wherein not all recorded data are copied or moved

G11B2020/10851

Erasing data on the record carrier

G11B2020/10861

Finalising a record carrier after a recording operation, e.g. to ensure compatibility with a ROM medium

G11B2020/1087

wherein a selection is made among at least two alternative ways of processing

G11B2020/10879

the kind of record carrier being the selection criterion

G11B2020/10888

the kind of data being the selection criterion

G11B2020/10898

Overwriting or replacing recorded data

G11B2020/10907

using pseudo-overwriting, i.e. virtually or logically overwriting data on WORM media by remapping recorded blocks to alternate areas

G11B2020/10916

Seeking data on the record carrier for preparing an access to a specific address

G11B2020/10925

involving an inter-layer jump, i.e. changing from one recording layer to another

G11B2020/10935

wherein a time constraint must be met

G11B2020/10944

Real-time recording or reproducing, e.g. for ensuring seamless playback of AV data

G11B2020/10953

Concurrent recording or playback of different streams or files

G11B2020/10962

wherein both recording and playback take place simultaneously

G11B2020/10972

Management of interruptions, e.g. due to editing

G11B2020/10981

Recording or reproducing data when the data rate or the relative speed between record carrier and transducer is variable

G11B2020/1099

wherein a disc is spun at a variable speed

G11B20/12

Formatting, e.g. arrangement of data block or words on the record carriers

within interface between computers and data recorders G06F3/06

G11B20/1201

on tapes

G11B20/1202

with longitudinal tracks only

G11B20/1204

for continuous data, e.g. digitised analog information signals, pulse code modulated [PCM] data

G11B20/1205

for discontinuous data, e.g. digital information signals, computer programme data

G11B20/1207

with transverse tracks only

G11B20/1208

for continuous data, e.g. digitised analog information signals, pulse code modulated [PCM] data

G11B20/1209

for discontinuous data, e.g. digital information signals, computer programme data

G11B20/1211

with different data track configurations longitudinal control tracks with transverse user data tracks G11B20/1207

G11B20/1212

for continuous data, e.g. digitised analog information signals, pulse code modulated [PCM] data

G11B20/1214

for discontinuous data, e.g. digital information signals, computer programme data

G11B20/1215

on cards optical aspect of optical cards G11B7/0033

G11B20/1217

on discs

G11B2020/1218

wherein the formatting concerns a specific area of the disc

G11B2020/122

Burst cutting area [BCA]

G11B2020/1221

cluster, i.e. a data structure which consists of a fixed number of sectors or ECC blocks

G11B2020/1222

ECC block, i.e. a block of error correction encoded symbols which includes all parity data needed for decoding pure error correction aspects G11B20/18

G11B2020/1224

extent, i.e. a set of sectors which numbers form a continuous ascending sequence

G11B2020/1225

frame, i.e. a subunit of a sector containing user data, e.g. a sync frame

G11B2020/1227

one layer of multilayer disc

G11B2020/1228

middle zone or outer guard area of a multilayer disc

G11B2020/1229

lead-in area

G11B2020/1231

lead-out area

G11B2020/1232

sector, i.e. the minimal addressable physical data unit

G11B2020/1234

wherein the sector is a headerless sector, i.e. it does not comprise an ID field

G11B2020/1235

session, i.e. a contiguous area having its own lead-in area, program area and lead-out area

G11B2020/1237

recording side of a single layer medium

G11B2020/1238

track, i.e. the entire a spirally or concentrically arranged path on which the recording marks are located

G11B2020/1239

the track being a pregroove, e.g. the wobbled track of a recordable optical disc

G11B2020/1241

user area, i.e. the area of a disc where user data are to be recorded

G11B2020/1242

the area forming one or more zones, wherein each zone is shaped like an annulus or a circular sector

G11B2020/1244

CAV zone, in which a constant angular velocity is used

G11B2020/1245

CLV zone, in which a constant linear velocity is used

G11B2020/1247

rewritable zone, e.g. a RAM zone of a hybrid disc having ROM and RAM areas

G11B2020/1248

ROM zone, i.e. an unrewritable zone

G11B2020/1249

wherein the bits are arranged on a two-dimensional hexagonal lattice

G11B20/1251

for continuous data, e.g. digitised analog information signals, pulse code modulated [PCM] data

G11B20/1252

for discontinuous data, e.g. digital information signals, computer programme data

G11B20/1254

for mixed data, i.e. continuous and discontinuous data

G11B2020/1255

Fixed Block Architecture [FBA] format

G11B2020/1257

Count Key Data [CKD] format

G11B20/1258

where blocks are arranged within multiple radial zones, e.g. Zone Bit Recording or Constant Density Recording discs, MCAV discs, MCLV discs

G11B2020/1259

with ROM/RAM areas

G11B20/1261

on films, e.g. for optical moving-picture soundtracks optical aspect G11B7/0032

G11B20/1262

with more than one format/standard, e.g. conversion from CD-audio format to R-DAT format

G11B2020/1264

wherein the formatting concerns a specific kind of data

G11B2020/1265

Control data, system data or management information, i.e. data used to access or process user data

G11B2020/1267

Address data

G11B2020/1268

Address in pregroove [ADIP] information

G11B2020/1269

Absolute time in pregroove [ATIP] information

G11B2020/1271

the address data being stored in a subcode, e.g. in the Q channel of a CD

G11B2020/1272

Burst indicator subcode [BIS]

G11B2020/1274

stored in pre-pits, i.e. in embossed pits, ROM marks or prepits

G11B2020/1275

Calibration data, e.g. specific training patterns for adjusting equalizer settings or other recording or playback parameters

G11B2020/1277

for managing gaps between two recordings, e.g. control data in linking areas, run-in or run-out fields, guard or buffer zones

G11B2020/1278

Physical format specifications of the record carrier, e.g. compliance with a specific standard, recording density, number of layers, start of data zone or lead-out

G11B2020/1279

Permanent information and control data stored in the PIC zone of a Blu-Ray disc

G11B2020/1281

Servo information

G11B2020/1282

in embedded servo fields

G11B2020/1284

in servo fields which split data fields

G11B2020/1285

Status of the record carrier, e.g. space bit maps, flags indicating a formatting status or a write permission

G11B2020/1287

Synchronisation pattern, e.g. VCO fields specific bit sequences of sync patterns G11B20/1403; A/V synchronisation G11B27/00

G11B2020/1288

Formatting by padding empty spaces with dummy data, e.g. writing zeroes or random data when de-icing optical discs

G11B2020/1289

Formatting of user data

G11B2020/1291

wherein the formatting serves a specific purpose

G11B2020/1292

Enhancement of the total storage capacity

G11B2020/1294

Increase of the access speed

G11B2020/1295

wherein the focus is on the read access speed

G11B2020/1297

wherein the focus is on the write access speed

G11B2020/1298

Enhancement of the signal quality

G11B20/14

using self-clocking codes

G11B20/1403

characterised by the use of two levels

G11B20/1407

code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol

G11B20/1411

conversion to or from pulse width coding

G11B20/1415

conversion to or from pulse frequency coding

G11B20/1419

to or from biphase level coding, i.e. to or from codes where a one is coded as a transition from a high to a low level during the middle of a bit cell and a zero is encoded as a transition from a low to a high level during the middle of a bit cell or vice versa, e.g. split phase code, Manchester code conversion to or from biphase space or mark coding, i.e. to or from codes where there is a transition at the beginning of every bit cell and a one has no second transition and a zero has a second transition one half of a bit period later or vice versa, e.g. double frequency code, FM code

G11B20/1423

Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code

G11B20/1426

conversion to or from block codes or representations thereof

G11B2020/143

4 to 6 modulation

G11B2020/1434

8 to 9 modulation

G11B2020/1438

8 to 10 modulation

G11B2020/1442

8 to 12 modulation

G11B2020/1446

16 to 17 modulation

G11B2020/1449

24 to 25 modulation

G11B2020/1453

17PP modulation, i.e. the parity preserving RLL(1,7) code with rate 2/3 used on Blu-Ray discs

G11B2020/1457

wherein DC control is performed by calculating a digital sum value [DSV]

G11B2020/1461

8 to 14 modulation, e.g. the EFM code used on CDs or mini-discs

G11B2020/1465

8 to 16 modulation, e.g. the EFM+ code used on DVDs

G11B2020/1469

modulation code with one or more merging bits between consecutive codewords

G11B2020/1473

modulation code without any merging bits

G11B2020/1476

Synchronisation patterns; Coping with defects thereof

G11B2020/148

using error detecting or error correcting codes

G11B2020/1484

Codewords used in servo patterns

G11B20/1488

characterised by the use of three levels

G11B20/1492

two levels are symmetric, in respect of the sign to the third level which is "zero"

G11B20/1496

characterised by the use of more than three levels

G11B20/16

using non self-clocking codes, i.e. the clock signals are either recorded in a separate clocking track or in a combination of several information tracks

G11B20/18

Error detection or correction

Testing

, e.g. of drop-outs

G11B20/1803

by redundancy in data representation

G11B20/1806

Pulse code modulation systems for audio signals G11B20/1803 takes precedence

G11B20/1809

by interleaving

G11B20/1813

by adding special bits or symbols to the coded information G11B20/1809 takes precedence

G11B20/1816

Testing

G11B20/182

using test patterns

G11B2020/1823

wherein a flag is set when errors are detected or qualified

G11B2020/1826

wherein a defect list or error map is generated

G11B2020/183

wherein at least one additional attempt is made to read or write the data when a first attempt is unsuccessful

G11B20/1833

by adding special lists or symbols to the coded information G11B20/1806, G11B20/1866 take precedence

G11B2020/1836

using a Reed Solomon [RS] code

G11B2020/184

using a cross-interleaved Reed Solomon [CIRC]

G11B2020/1843

using a cyclic redundancy check [CRC]

G11B2020/1846

using a picket code, i.e. a code in which a long distance code [LDC] is arranged as an array and columns containing burst indicator subcode [BIS] are multiplexed for erasure decoding

G11B2020/185

using an low density parity check [LDPC] code

G11B2020/1853

using a product code which has inner and outer parity symbols

G11B2020/1856

using a turbo code

G11B2020/1859

wherein a trellis is used for decoding the error correcting code

G11B2020/1863

wherein the Viterbi algorithm is used for decoding the error correcting code

G11B20/1866

by interleaving G11B20/1809 takes precedence

G11B2020/1869

Preventing ageing phenomena from causing data loss, e.g. by monitoring the age of record carriers or by recognising wear, and by copying information elsewhere when a record carrier becomes unreliable

G11B2020/1873

Temporary defect structures for write-once discs, e.g. TDDS, TDMA or TDFL

G11B20/1876

Interpolating methods

G11B20/1879

Direct read-after-write methods

G11B20/1883

Methods for assignment of alternate areas for defective areas

G11B20/1886

with tapes

G11B20/1889

with discs

G11B2020/1893

using linear replacement to relocate data from a defective block to a non-contiguous spare area, e.g. with a secondary defect list [SDL]

G11B2020/1896

using skip or slip replacement to relocate data from a defective block to the next usable block, e.g. with a primary defect list [PDL]

G11B20/20

for correction of skew for multitrack recording

G11B20/22

for reducing distortions

G11B20/225

for reducing wow or flutter by controlling the speed of the record carrier G11B15/46, G11B19/28

G11B20/24

for reducing noise

control of amplification in general, e.g. dependent upon noise level H03G

G11B21/00

Head arrangements not specific to the method of recording or reproducing

G11B21/003

Disposition of fixed heads, e.g. for scanning, selecting or following of tracks

G11B21/006

for track following

G11B21/02

Driving or moving of heads

G11B21/022

Programmed access in sequence to indexed parts of operating record carriers

G11B21/025

of rotating discs

G11B21/027

of tapes

G11B21/03

for correcting time base error

during transducing operation, by driving or moving the head in a direction more or less parallel to the direction of travel of the recording medium, e.g. tangential direction on a rotating disc by driving or moving the head in a direction which cuts across the direction of travel of the recording medium G11B15/1808, G11B15/467

G11B21/04

Automatic feed mechanism producing a

progressive

transducing traverse of the head in a direction which cuts across the direction of travel of the recording medium, e.g. helical scan

, e.g. by lead-screw G11B19/20, G11B21/08 and G11B21/10 take precedence

G11B21/043

for stationary discs

G11B21/046

details of the feed mechanism

G11B21/06

the record carrier having

mechanical

means to ensure traverse movement of the head

, e.g. grooves

G11B21/08

Track changing or selecting G11B21/12 takes precedence

during transducing operation

G11B21/081

Access to indexed tracks or parts of continuous track

G11B21/083

on discs

G11B21/085

with track following of accessed part

G11B21/086

on tapes

G11B21/088

with track following of accessed part

G11B21/10

Track finding or aligning by moving the head

Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following characterised by the track access method G11B21/08

G11B21/103

on tapes

G11B21/106

on disks

G11B21/12

Raising and lowering

Back-spacing or forward-spacing along track

Returning to starting position

otherwise than during transducing operation

G11B21/14

manually

G11B21/16

Supporting the heads

Supporting the sockets for plug-in heads

G11B21/18

while the head is moving

G11B21/20

while the head is in operative position but stationary or permitting minor movements to follow irregularities in surface of record carrier

G11B21/21

with provision for maintaining desired spacing of head from record carrier, e.g. fluid-dynamic spacing, slider

G11B21/22

while the head is out of operative position

G11B21/24

Head support adjustments

G11B21/26

Means for interchange or replacement of head or head element

G11B23/00

Record carriers not specific to the method of recording or reproducing

Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus

Intermediate mediums; Apparatus or processes specially adapted for their manufacture processes involving a single technical art and for which provision exists elsewhere, see the relevant class, e.g. B29, B41M, B05D, C08L, F16N

In group G11B23/00, recording or reproducing apparatus does not include the record carriers.

G11B23/0007

Circuits or methods for reducing noise, for correction of distortion, or for changing density of recorded information, volume compression or expansion circuits per se

H03G7/00

This group is closed down and will in due course be transferred to G11B20/22 and G11B20/24 and subgroups

G11B23/0014

record carriers not specifically of filamentary or web form G11B23/0057 takes precedence

G11B23/0021

discs

G11B23/0028

Details

G11B23/0035

means incorporated in the disc, e.g. hub, to enable its guiding, loading or driving means for driving the head G11B21/06; guiding the disc for centering or locking G11B17/022; turntables or spindles for driving G11B19/2009

G11B23/0042

with provision for auxiliary features sensing such features G11B17/00, G11B19/02

G11B23/005

flexible discs G11B23/0035 takes precedence

G11B23/0057

Intermediate mediums, i.e. mediums provided with an information structure not specific to the method of reproducing or duplication such as matrixes for mechanical pressing of an information structure for record carriers with directly readable mechanical information G11B3/685; record carriers having a relief information structure provided with or included in layers not specific for a single reproducing method; apparatus or processes specially adapted for their manufacture

G11B23/0064

mediums or carriers characterised by the selection of the material

G11B23/0071

additional layers for lubrication or wear protection lubricating means not integrated in the record carrier structure G11B23/50

G11B23/0078

information structure layers using metallic or dielectric coatings

G11B23/0085

intermediate mediums using a photosensitive material, e.g. photo-resist

G11B23/0092

molding resin compositions

G11B23/02

Containers

Storing means

both adapted to cooperate with the recording or reproducing means

G11B23/021

comprising means for reducing influence of physical parameters, e.g. temperature change, moisture combined with means for reconditioning or cleaning G11B23/507

G11B23/023

Containers for magazines or cassettes

G11B23/0233

Containers for a single cassette

G11B23/0236

Containers for several cassettes

G11B23/027

Containers for single reels or spools

G11B23/03

Containers for flat record carriers

G11B23/0301

Details

G11B23/0302

Auxiliary features

G11B23/0303

Write protect features with a sliding part

G11B23/0305

Semiconductor memories

G11B23/0306

Means for locking the record carriers

G11B23/0307

Positioning or centering features

G11B23/0308

Shutters G11B23/0317 takes precedence

G11B23/031

Indicating means, e.g. sticker, bar code

G11B23/0311

Wrong insertion preventing means

G11B23/0312

Driving features

G11B23/0313

Container cases

G11B23/0315

Materials

G11B23/0316

Constructional details, e.g. shape

G11B23/0317

Containers with interchangeable record carriers

G11B23/0318

Containers with incorporated transducing heads

G11B23/032

for rigid discs

G11B23/0321

rigid cartridges for single discs

G11B23/0322

comprising latching or movable handling devices G11B17/032 takes precedence

G11B23/0323

for disc-packs

G11B23/0325

comprising latching or movable handling devices G11B17/038 takes precedence

G11B23/0326

Assembling of containers

G11B23/0327

for special applications not otherwise provided for

G11B23/0328

the disc having to be extracted from the cartridge for recording reproducing, e.g. cooperating with an extractable tray

G11B23/033

for flexible discs

G11B23/0332

for single discs, e.g. envelopes

G11B23/0335

for disc packs

G11B23/0337

comprising latching or movable handling devices G11B23/0325 and G11B17/038 take precedence

G11B23/037

Single reels or spools

G11B23/04

Magazines

Cassettes

for webs or filaments

G11B23/12 takes precedence

; cassettes with sealing or locking means G11B23/28; dummy cassettes for locking in the drive G11B33/005

G11B23/041

Details

G11B23/042

Auxiliary features sensing such features G11B15/06

G11B23/043

Brakes for tapes or tape reels

G11B23/044

Reels or cores; positioning of the reels in the cassette

G11B23/045

Covers

G11B23/046

Indicating means, e.g. quantity of tape

G11B23/047

Guiding means

G11B23/048

Driving features

G11B23/049

Cassettes for special applications not otherwise provided for

G11B23/06

for housing endless webs or filaments

G11B23/07

using a single reel or core

G11B23/08

for housing webs or filaments having two distinct ends

G11B23/087

using two different reels or cores

G11B23/08707

Details

G11B23/08714

Auxiliary features sensing such features G11B15/06

G11B23/08721

Brakes for tapes or tape reels G11B23/08707 takes precedence

G11B23/08728

Reels or cores; positioning of the reels in the cassette

G11B23/08735

Covers

G11B23/08742

in combination with brake means

G11B23/0875

Indicating means, e.g. quantity of tape

G11B23/08757

Guiding means

G11B23/08764

Liner sheets

G11B23/08771

Pressure pads

G11B23/08778

Driving features, e.g. belt

G11B23/08785

Envelopes

G11B23/08792

Shielding devices

G11B23/093

the reels or cores being coaxial

G11B23/107

using one reel or core, one end of the record carrier coming out of the magazine or cassette

G11B23/113

Apparatus or processes specially adapted for the manufacture of magazines or cassettes

, e.g. initial loading into container processes involving a single technical art and for which provision exists elsewhere, see the relevant class, e.g. B21, B29, B65

G11B23/12

Bins for random storage of webs or filaments

G11B23/14

providing ability to repeat location, e.g. using sprocket holes

G11B23/16

Record carriers with single-track for recording at spaced intervals along the track thereof, e.g. for speech or language training

contains no documents

G11B23/18

Record carriers with multiple tracks, e.g. with complementary and partial tracks such as paired "stereo" tracks

contains no documents

G11B23/20

with provision for splicing to provide permanent or temporary connections

G11B23/22

of endless belts

of tapes forming Moebius loops

G11B23/24

of tapes having multiple tracks parallel to edge of record carrier by offset splicing to form endless loop with one or more helical tracks

G11B23/26

of leaders for loading or threading, e.g. to form a temporary connection

G11B23/28

Indicating

or preventing

prior or unauthorised use,

e.g. cassettes with sealing or locking means, write-protect devices for discs write-protect devices for tapes G11B23/042, G11B23/08714; dummy cassettes for locking in the drive G11B33/005

G11B23/281

by changing the physical properties of the record carrier

G11B23/282

Limited play

G11B23/283

Security features, e.g. digital codes

G11B23/284

on the record carrier

G11B23/285

on the container or cartridge

G11B23/286

Antitheft arrangements, e.g. Electronic Article Surveillance [EAS] tags

G11B23/287

by mechanical lock

G11B23/288

Protecting disks from being written or overwritten

G11B23/30

with provision for auxiliary signals

G11B23/32

Electrical or mechanical contacting means

Tape stop foils

G11B23/34

Signal means additional to the main recording track, e.g. photoelectric sensing of sprocket holes for timing

G11B23/36

Signals on record carriers or on containers and recorded by the same method as the main recording

G11B23/38

Visual features other than those contained in record tracks or represented by sprocket holes

the visual signals being auxiliary signals

G11B23/40

Identifying or analogous means applied to or incorporated in the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader, photograph

G11B23/42

Marks for indexing, speed-controlling, synchronising, or timing

G11B23/44

Information for display simultaneously with playback of the record, e.g. photographic matter associated working of cameras or projectors with sound recording or reproducing means G03B31/00

G11B23/50

Reconditioning of record carriers

Cleaning of record carriers

; Carrying-off electrostatic charges

G11B3/58 takes precedence

G11B23/502

of tape carriers

G11B23/505

of disk carriers

G11B23/507

combined with means for reducing influence of physical parameters, e.g. temperature change, moisture

G11B25/00

Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing

, e.g. dictating apparatus; Combinations of such apparatus

G11B25/02

using cylindrical record carriers

G11B25/04

using flat record carriers, e.g. disc, card

G11B25/043

using rotating discs

G11B25/046

using stationary discs, or cards provided with a circular recording area driving heads relatively to stationary record carriers for mechanical transducing G11B3/40; automatic feed mechanism producing a transducing traverse of the head across stationary disk tracks G11B21/043

G11B25/06

using web-form record carriers, e.g. tape

G11B25/063

using tape inside container

G11B25/066

adapted for use with containers of different sizes or configurations; adaptor devices therefor

G11B25/08

using filamentary record carriers, e.g. wire

G11B25/10

Apparatus capable of using record carriers defined in more than one of the sub-groups G11B25/02 - G11B25/08;

Adaptor devices therefor

G11B27/00

Editing

Indexing

Addressing

Timing or synchronising

Monitoring

Measuring tape travel

G11B27/002

Programmed access in sequence to a plurality of record carriers or indexed parts, e.g. tracks, thereof, e.g. for editing; transfer of record carriers from magazine G11B15/68, G11B17/10; G11B17/22

G11B27/005

Reproducing at a different information rate from the information rate of recording for television signals H04N5/783

G11B27/007

reproducing continuously a part of the information, i.e. repeating

G11B27/02

Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers

G11B27/022

Electronic editing of analogue information signals, e.g. audio or video signals

G11B27/024

on tapes G11B27/028, G11B27/029 take precedence

G11B27/026

on discs G11B27/028, G11B27/029 take precedence

G11B27/028

with computer assistance

G11B27/029

Insert-editing

G11B27/031

Electronic editing of digitised analogue information signals, e.g. audio or video signals

G11B27/032

on tapes G11B27/036, G11B27/038 take precedence

G11B27/034

on discs G11B27/036, G11B27/038 take precedence

G11B27/036

Insert-editing

G11B27/038

Cross-faders therefor

G11B27/04

using differential drive of record carrier and head

transferred to G11B15/1875

G11B27/06

Cutting and rejoining

Notching, or perforating record carriers otherwise than by recording styli record carriers with provision for splicing G11B23/20

G11B27/10

Indexing

Addressing

Timing or synchronising

Measuring tape travel

G11B27/102

Programmed access in sequence to addressed parts of tracks of operating record carriers access by moving the head G11B3/08, G11B5/54, G11B7/085, G11B21/022; by moving the record carrier G11B15/005, G11B17/005, by driving of both record carrier and head G11B15/1816

G11B27/105

of operating discs

G11B27/107

of operating tapes

G11B27/11

by using information not detectable on the record carrier

G11B27/13

the information being derived from movement of the record carrier, e.g. using tachometer

G11B27/15

using mechanical sensing means

see provisionally also G11B27/13

G11B27/17

using electrical sensing means

see provisionally also G11B27/13

G11B27/19

by using information detectable on the record carrier

G11B27/22

Means responsive to presence or absence of recorded information signals

G11B27/24

by sensing features on the record carrier other than the transducing track

; sensing signals or marks recorded by another method than the main recording

G11B27/26

by photoelectric detection, e.g. of sprocket holes

G11B27/28

by using information signals recorded by the same method as the main recording

G11B27/22 takes precedence

G11B27/30

on the same track as the main recording

G11B27/3009

used signal is a pilot signal inside the frequency band of the recorded main information signal

G11B27/3018

used signal is a pilot signal outside the frequency band of the recorded main information signal

G11B27/3027

used signal is digitally coded

G11B27/3036

Time code signal

G11B27/3045

superimposed on the recorded main signal, e.g. burn-in-time code

G11B27/3054

Vertical Interval Time code [VITC]

G11B27/3063

Subcodes

G11B27/3072

Coded signal uses a correlation function for detection

G11B27/3081

used signal is a video-frame or a video-field (P.I.P)

G11B27/309

Table of contents

G11B27/32

on separate auxiliary tracks of the same or an auxiliary record carrier

G11B27/321

used signal consists of two 180-degr. phase shifted signals of the same frequency

G11B27/322

used signal is digitally coded

G11B27/323

Time code signal, e.g. on a cue track as SMPTE- or EBU-time code

G11B27/324

Duty cycle modulation of control pulses, e.g. VHS-CTL-coding systems, RAPID-time code, VASS- or VISS-cue signals

G11B27/325

Subcodes

G11B27/326

used signal is a video-frame or a video-field (P.I.P.)

G11B27/327

Table of contents

G11B27/328

on a tape [TTOC]

G11B27/329

on a disc [VTOC]

G11B27/34

Indicating arrangements indicating measured values in general G01D

indicating means incorporated in magazine or cassette G11B23/046 and G11B23/0875

G11B27/36

Monitoring, i.e. supervising the progress of recording or reproducing

for digital recording G11B20/00 and s.gr.; for monitoring, testing or measuring of TV recorders of the type covered by H04N5/76 and subgroups, see

H04N17/06

G11B31/00

Arrangements for the associated working of recording or reproducing apparatus with related apparatus with cameras or projectors G03B31/00

; recording/reproducing of music for electrophonic musical instruments G10H1/0033; automatic arrangements for answering calls or for recording messages for absent subscribers H04M1/64; telephonic communication systems adapted for combination with dictation recording and playback systems H04M11/10; connection of TV recorder with other related apparatus, e.g. TV camera or receiver, in which the TV signal is significantly involved H04N, e.g. H04N23/00, H04N5/765; combination of radio or TV with other apparatus, e.g. with vehicles H05K11/00

G11B31/003

with radio receiver

G11B31/006

with video camera or receiver

G11B31/02

with automatic musical instruments

G11B33/00

Constructional parts, details or accessories not provided for in the other groups of this subclass

G11B33/005

Means for locking the disc or cassette receiving slot, e.g. dummy cassettes locked in the slot

G11B33/02

Cabinets

Cases

Stands

Disposition of apparatus therein or thereon

G11B33/022

Cases

G11B33/025

Portable cases

G11B33/027

Covers G11B33/022 takes precedence; with means for guiding the record carrier G11B17/34

G11B33/04

modified to store record carriers

containers, storing means adapted for cooperation with the recording or reproducing apparatus G11B23/02

G11B33/0405

for storing discs anti-theft cases with locking means E05B73/0023

G11B33/0411

Single disc boxes G11B33/0461 takes precedence

G11B33/0416

for disc cartridges

G11B33/0422

for discs without cartridge

G11B33/0427

comprising centre hole locking means

G11B33/0433

Multiple disc containers G11B33/0461 takes precedence

G11B33/0438

for disc cartridges

G11B33/0444

for discs without cartridge

G11B33/045

comprising centre hole locking means

G11B33/0455

for single disc boxes

G11B33/0461

Disc storage racks

G11B33/0466

for disc cartridges

G11B33/0472

for discs without cartridge

G11B33/0477

comprising centre hole locking means

G11B33/0483

for single disc boxes

G11B33/0488

in boxes or containers comprising additional sound reproducing or activating means

G11B33/0494

packages made by folding

G11B33/06

combined with other apparatus having a different main function

G11B33/08

Insulation or absorption of undesired vibrations or sounds

G11B33/10

Indicating arrangements

Warning arrangements

G11B15/04, G11B19/04, G11B27/34, G11B27/36 take precedence

G11B33/12

Disposition of constructional parts in the apparatus, e.g. of power supply, of modules

G11B33/121

the apparatus comprising a single recording/reproducing device

G11B33/122

Arrangements for providing electrical connections, e.g. connectors, cables, switches

G11B33/123

Mounting arrangements of constructional parts onto a chassis

G11B33/124

of the single recording/reproducing device, e.g. disk drive, onto a chassis

G11B33/125

the apparatus comprising a plurality of recording/reproducing devices, e.g. modular arrangements, arrays of disc drives

G11B33/126

Arrangements for providing electrical connections, e.g. connectors, cables, switches

G11B33/127

Mounting arrangements of constructional parts onto a chassis

G11B33/128

of the plurality of recording/reproducing devices, e.g. disk drives, onto a chassis

G11B33/14

Reducing influence of physical parameters, e.g. temperature change, moisture, dust

G11B33/1406

Reducing the influence of the temperature

G11B33/1413

by fluid cooling

G11B33/142

by air cooling

G11B33/1426

by cooling plates, e.g. fins

G11B33/1433

by reducing the effects of the thermal expansion

G11B33/144

by detection, control, regulation of the temperature

G11B33/1446

Reducing contamination, e.g. by dust, debris

G11B33/1453

by moisture

G11B33/146

constructional details of filters

G11B33/1466

sealing gaskets, gasket in general F16J

G11B33/1473

of/from bearings

G11B33/148

Reducing friction, adhesion, drag

G11B33/1486

Control/regulation of the pressure, e.g. the pressure inside the housing of a drive

G11B33/1493

Electro-Magnetic Interference [EMI] or Radio Frequency Interference [RFI] shielding; grounding of static charges

G11B2209/00

Recording or reproducing using a method not covered elsewhere in this subclass

G11B2209/02

transducing on or investigating record carriers or information recording transducers or systems by using near-field interactions

G11B2220/00

Record carriers by type

G11B2220/17

Card-like record carriers

G11B2220/20

Disc-shaped record carriers

G11B2220/21

characterised in that the disc is of read-only, rewritable, or recordable type

G11B2220/211

Discs having both read-only and rewritable or recordable areas containing application data

Partial ROM media

G11B2220/213

Read-only discs

G11B2220/215

Recordable discs

G11B2220/216

Rewritable discs

G11B2220/218

Write-once discs

G11B2220/23

characterised in that the disc has a specific layer structure

G11B2220/232

Double-sided discs, i.e. two recording layers accessed from opposite sides

G11B2220/235

Multilayer discs, i.e. multiple recording layers accessed from the same side

G11B2220/237

having exactly two recording layers

G11B2220/25

characterised in that the disc is based on a specific recording technology

G11B2220/2504

Holographic discs

Holographic digital data storage [HDDS]

G11B2220/2508

Magnetic discs

G11B2220/2512

Floppy disks

G11B2220/2516

Hard disks

G11B2220/252

Patterned or quantised magnetic media, i.e. bits are stored in predefined single domain elements

G11B2220/2525

Magneto-optical [MO] discs

G11B2220/2529

Mini-discs

G11B2220/2533

MO disc using magnetic super resolution, i.e., the magnetic mark is smaller than the laser spot size

G11B2220/2537

Optical discs

G11B2220/2541

Blu-ray discs

Blue laser DVR discs

G11B2220/2545

CDs

G11B2220/255

CD-I, i.e. CD-interactive

G11B2220/2554

CD-V [CD-Video], CDV, or CD+V, as defined in IEC 61104

G11B2220/2558

CD-XA format, i.e. eXtended architecture extension of the CD-ROM standard

G11B2220/2562

DVDs [digital versatile discs]

Digital video discs

MMCDs

HDCDs

G11B2220/2566

DVDs belonging to the minus family, i.e. -R, -RW, -VR

G11B2220/257

DVDs belonging to the plus family, i.e. +R, +RW, +VR

G11B2220/2575

DVD-RAMs

G11B2220/2579

HD-DVDs [high definition DVDs]

AODs [advanced optical discs]

G11B2220/2583

wherein two standards are used on a single disc, e.g. one DVD section and one CD section

G11B2220/2587

Laser Discs

Optical disc using analog recording

G11B2220/2591

SFFO discs, i.e. small form factor optical discs

Portable blue

G11B2220/2595

Super-resolution optical discs, i.e. optical discs wherein the size of marks is below the optical diffraction limit

G11B2220/40

Combinations of multiple record carriers

G11B2220/41

Flat as opposed to hierarchical combination, e.g. library of tapes or discs, CD changer, or groups of record carriers that together store one title

G11B2220/412

Distributed storage methods, i.e. the system may autonomously determine for a storage device that provides enough storage capacity for recording

G11B2220/415

Redundant array of inexpensive disks [RAID] systems

G11B2220/417

Redundant array of inexpensive tapes [RAIT] systems

G11B2220/45

Hierarchical combination of record carriers, e.g. HDD for fast access, optical discs for long term storage or tapes for backup

G11B2220/455

said record carriers being in one device and being used as primary and secondary/backup media, e.g. HDD-DVD combo device, or as source and target media, e.g. PC and portable player

G11B2220/60

Solid state media details of solid state memory devices G11C

G11B2220/61

wherein solid state memory is used for storing A/V content storing computer data in solid state memories G06F

G11B2220/63

wherein solid state memory is used as a supplementary storage medium to store auxiliary data for detecting or correcting errors on a main storage medium

G11B2220/65

wherein solid state memory is used for storing indexing information or metadata

G11B2220/652

said memory being attached to the recording medium

G11B2220/655

Memory in cassette [MIC]

G11B2220/657

Memory in disc [MID]

G11B2220/80

Indexing information stored in optical or magnetic or other strip attached to cassette or disc, e.g. barcodes attached to a recording medium

G11B2220/90

Tape-like record carriers

G11B2220/91

Helical scan format, wherein tracks are slightly tilted with respect to tape direction, e.g. VHS, DAT, DVC, AIT or exabyte

G11B2220/913

Digital audio tape [DAT] format

G11B2220/916

Digital data storage [DDS] format

G11B2220/93

Longitudinal format, wherein tracks are in the direction of the tape, read with a static head, e.g. DCC

G11B2220/95

Serpentine format, wherein a single track or group of tracks traverses the tape plural times from one end to the other

G11B2220/953

Digital linear tape [DLT] format

G11B2220/956

Linear tape open [LTO] format