System for write once read many optical storage devices to appear rewritable
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United States of America Patent
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Jun 8, 1993
Issued Date -
N/A
app pub date -
Sep 16, 1988
filing date -
Jan 2, 1987
priority date (Note) -
Expired
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Abstract
A system for Write Once Read Many (WORM) optical storage devices to appear rewritable uses magnetic disk storage and optical WORM storage subsystem. All new write operations are made to a magnetic cache storage which resides on the magnetic disk subsystem. A Least Recently Written (LRW) technique is used to determine which valid data in cache storage is the oldest and must be transfered to optical storage to make room for new data. In this manner all new write operations are performed to the magnetic cache storage and only the oldest valid data is transferred to optical disk, optimizing its use.
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