Readable indelible mark on storage media
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United States of America Patent
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-
Sep 3, 2002
Issued Date -
N/A
app pub date -
May 25, 2001
filing date -
Jul 1, 1998
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A storage media is disclosed and comprises a storage body and a readable indelible mark formed in the body such that portions thereof are indelibly altered. The mark is read by writing first data to the body in the region of the mark, and reading second data from the body in such region. The written first data is not accepted where the portions of the body are indelibly altered. Accordingly, the read second data corresponds to the written first data with segments thereof missing. The missing segments of the first data correspond to the portions of the body indelibly altered. In a preferred embodiment, the storage media comprises a magnetic rotatable disk having a substantially planar substrate and a magnetizable layer deposited thereon. The reading and writing are therefore performed magnetically.
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