GB8918397D0 - Optically readable data carriers - Google Patents

Optically readable data carriers

Info

Publication number
GB8918397D0
GB8918397D0 GB898918397A GB8918397A GB8918397D0 GB 8918397 D0 GB8918397 D0 GB 8918397D0 GB 898918397 A GB898918397 A GB 898918397A GB 8918397 A GB8918397 A GB 8918397A GB 8918397 D0 GB8918397 D0 GB 8918397D0
Authority
GB
United Kingdom
Prior art keywords
readable data
data carriers
optically readable
optically
carriers
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.)
Withdrawn
Application number
GB898918397A
Other versions
GB2235808A (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMALL ERNEST P
Original Assignee
SMALL ERNEST P
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SMALL ERNEST P filed Critical SMALL ERNEST P
Priority to GB8918397A priority Critical patent/GB2235808A/en
Publication of GB8918397D0 publication Critical patent/GB8918397D0/en
Publication of GB2235808A publication Critical patent/GB2235808A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • G11B7/268—Post-production operations, e.g. initialising phase-change recording layers, checking for defects
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • 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
    • G11B23/28—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs
    • G11B23/281—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs by changing the physical properties of the record carrier

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Security & Cryptography (AREA)
  • Optical Recording Or Reproduction (AREA)
GB8918397A 1989-08-11 1989-08-11 Optically readable data carriers Withdrawn GB2235808A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8918397A GB2235808A (en) 1989-08-11 1989-08-11 Optically readable data carriers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8918397A GB2235808A (en) 1989-08-11 1989-08-11 Optically readable data carriers

Publications (2)

Publication Number Publication Date
GB8918397D0 true GB8918397D0 (en) 1989-09-20
GB2235808A GB2235808A (en) 1991-03-13

Family

ID=10661513

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8918397A Withdrawn GB2235808A (en) 1989-08-11 1989-08-11 Optically readable data carriers

Country Status (1)

Country Link
GB (1) GB2235808A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5467327A (en) * 1993-12-22 1995-11-14 Jamail; Randall Method of masking data on a storage medium
JP3398452B2 (en) * 1994-01-19 2003-04-21 株式会社ソニー・ディスクテクノロジー Sputtering equipment

Also Published As

Publication number Publication date
GB2235808A (en) 1991-03-13

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)