Method and apparatus for process control, tension control, and testing of magnetic media
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United States of America Patent
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Apr 18, 1995
Issued Date -
N/A
app pub date -
Oct 29, 1993
filing date -
Apr 9, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus is disclosed for using the remanent noise of a magnetic medium as a fingerprint for benchmark testing of the magnetic medium as it is both manufactured and used. A cross-correlation is made between the fingerprint at various times as the magnetic medium is manipulated and is indicative of the integrity thereof. This cross-correlation media may be used to control manufacturing and recording processes, including tape tensioning and channel equalization. This cross-correlation between fingerprints can be used to control the tension applied to a thin film magnetic medium during record and/or playback.
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