Data security protection for information recorded on a rewritable storage medium using a write-once read-many storage medium
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United States of America Patent
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Jul 9, 1996
Grant Date -
N/A
app pub date -
Oct 3, 1994
filing date -
Oct 3, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A data storage system provides the data security afforded by write-once, read-many storage media and the lower cost afforded by rewritable storage media. To effectively write protect data, the system generates a protective code based upon the data to be stored, stores the protective code and a data identification on WORM media and stores the data and the location of the protective code on rewritable media. When the data is later read, it is verified by reading the data, generating a new protective code from the data and comparing the new code with the original code. Any difference between the two protective codes indicates that the data has been altered.
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