EP0260115A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Information record method
Assignee: Canon Inc
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Filing: 1987-09-08
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Granted: —
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Expires: 2007-09-08
Abstract
Abstract There is disclosed an information record medium having an area for recording data and an area for recording a directory used to manage the recorded data, by providing an area for recording information indicating logical erasure of the unnecessary data. In the information record method of the present invention, when unnecessary data is produced, information indicating the logical erasure of the data is recorded in the area of the information record medium in which the directory is recorded.
Inventors
- 👤 Wataru Sakagami
- 👤 Yutaka Ogasawara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 23:52
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/007; G11B7/00745; G06; G06F; G06F16/00; G06F16/90; G06F16/901; G06F16/9017; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/32; G11B27/327; G11B7/004; G06F2216/00; G06F2216/09
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
54 words
A method for recording information comprising steps of: recording data on an information record medium, recording a directory used to manage the data in a different area than that of the data; and recording information indicating logical erasure of data in the record area of the directory when the data is no longer necessary.
Claim 2
Independent Claim
54 words
A method for recording information comprising steps of: recording data on an information record medium, recording a directory used to manage the data in a different area than that of the data; and recording information indicating logical erasure of data in the record area of the directory when the data is no longer necessary.
Claim 3
Dependent Claim
44 words
An information record medium having an area having data recorded therein and an area having directory used to manage the data recorded therein, comprising: an area provided at a portion of the directory record area for recording information indicating logical erasure of unnecessary data.
Claim 4
Dependent Claim
44 words
An information record medium having an area having data recorded therein and an area having directory used to manage the data recorded therein, comprising: an area provided at a portion of the directory record area for recording information indicating logical erasure of unnecessary data.
Claim 5
Dependent Claim
52 words
An information record medium according to Claim 2 wherein the data is recorded in portions of tracks each having a number assigned thereto, and the erasure information record area is provided at a portion of a leading track number field indicating a leading track number on which the corresponding data is recorded.
Claim 6
Dependent Claim
27 words
An information record medium according to Claim 3 wherein at least one bit of the leading track number field is a delete bit indicting the erasure information.
Claim 7
Dependent Claim
24 words
An information record medium according to Claim 2 wherein said medium is a card-like optical record medium having a plurality of tracks formed thereon.
Claim 8
Dependent Claim
29 words
An information record medium according to Claim 5 wherein said tracks are recorded from one end thereof and said directly is recorded from the other end of the track.
References Cited (Backward Citations)
No citation records indexed.
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