Optical disk having an erased-state indicator and optical disk apparatus for reducing frequency of disk erasing operation
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Apr 1, 1997
Issued Date -
N/A
app pub date -
Dec 28, 1994
filing date -
Mar 18, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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