GB2042979B - Magnetic recording - Google Patents
Magnetic recordingInfo
- Publication number
- GB2042979B GB2042979B GB7906573A GB7906573A GB2042979B GB 2042979 B GB2042979 B GB 2042979B GB 7906573 A GB7906573 A GB 7906573A GB 7906573 A GB7906573 A GB 7906573A GB 2042979 B GB2042979 B GB 2042979B
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnetic recording
- recording
- magnetic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/00094—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers
- G11B20/00123—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/08—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
- G06K19/10—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards
- G06K19/12—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards the marking being sensed by magnetic means
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/00572—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium
- G11B20/00586—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the physical format of the recording medium
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/852—Orientation in a magnetic field
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2211/00—Indexing scheme relating to details of data-processing equipment not covered by groups G06F3/00 - G06F13/00
- G06F2211/007—Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Credit Cards Or The Like (AREA)
- Magnetic Record Carriers (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7906573A GB2042979B (en) | 1979-02-23 | 1979-02-23 | Magnetic recording |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7906573A GB2042979B (en) | 1979-02-23 | 1979-02-23 | Magnetic recording |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2042979A GB2042979A (en) | 1980-10-01 |
GB2042979B true GB2042979B (en) | 1982-09-22 |
Family
ID=10503404
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7906573A Expired GB2042979B (en) | 1979-02-23 | 1979-02-23 | Magnetic recording |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2042979B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0756272A3 (en) | 1995-07-28 | 1997-05-07 | Eastman Kodak Co | Magnetic medium having permanent magnetic feature |
US5736722A (en) * | 1996-02-08 | 1998-04-07 | Eastman Kodak Company | Dual sensor decoder |
GB0320957D0 (en) | 2003-09-08 | 2003-10-08 | Qinetiq Ltd | Document authentication |
GB201001603D0 (en) | 2010-02-01 | 2010-03-17 | Rue De Int Ltd | Security elements, and methods and apparatus for their manufacture |
-
1979
- 1979-02-23 GB GB7906573A patent/GB2042979B/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB2042979A (en) | 1980-10-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE3064977D1 (en) | Magnetic recorders | |
JPS5644169A (en) | Magnetic record assembly | |
JPS5661075A (en) | Recording disk | |
DE3069216D1 (en) | Magnetic head arrangement | |
GB2026946B (en) | Sucurity magnetic recording supports | |
GB2055877B (en) | Magnetic recording media | |
GB2055394B (en) | Magnetic recording medium | |
GB2057471B (en) | Magnetic recording media | |
GB2060237B (en) | Magnetic reproducing apparatus | |
GB2053257B (en) | Magnetic recording medium | |
DE3065149D1 (en) | Magnetic recording medium | |
GB2045979B (en) | Magnetic head arrangements | |
JPS56124127A (en) | Magnetic recording medium | |
JPS57113465A (en) | Magnetic recording disk-file | |
GB2054622B (en) | Magnetic recording medium | |
GB2063902B (en) | Magnetic recording medium | |
DE3063740D1 (en) | Magnetic head-mounting-assemblies | |
GB2057017B (en) | Recording member | |
JPS5658128A (en) | Magnetic recorder*regenerator | |
GB2058799B (en) | Magnetic recording medium | |
DE3066061D1 (en) | Magnetic recording medium | |
GB2063720B (en) | Magnetic transducer | |
JPS5634135A (en) | Magnetic record*reader | |
GB2054609B (en) | Magnetic recording medium | |
GB2017117B (en) | Magnetic recording meduim |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PE20 | Patent expired after termination of 20 years |
Effective date: 19990222 |