Optical disk having an erased-state indicator and optical disk a

Details Optical disk having an erased-state indicator and optical disk a Optical disk having an erased-state indicator and optical disk a

1994-12-28

1997-04-01

Tran, Thang V.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 54, 369 48, G11B 700

Patent

active

056173938

ABSTRACT:
An optical disk includes a user accessible area having a plurality of blocks and flag data recorded on the optical disk. The flag data indicates whether or not each of the blocks is in an erased state in which there is no recorded data. A flag area stores the flag data, and area data indicating that the optical disk has the flag area is recorded on the optical disk.

REFERENCES:
patent: 4958314 (1990-09-01), Imai et al.
patent: 5023854 (1991-06-01), Satoh et al.
patent: 5132954 (1992-07-01), Kulakowski et al.
patent: 5247494 (1993-09-01), Ohno et al.
patent: 5270877 (1993-12-01), Fukushima et al.

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