Method for the recording and reading of a two-layer magnetic tape, and system of implementation
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United States of America Patent
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Feb 2, 1999
Issued Date -
N/A
app pub date -
Aug 12, 1996
filing date -
Mar 20, 1992
priority date (Note) -
Expired
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Abstract
Data validation uses redundant storage of the data on two-layer magnetic tapes. A method and system provide data recording and reading on such magnetic tapes with a high degree of protection from errors and/or fraudulent behavior. The two-layer tape includes a first layer with a high coercive field positioned on a support and a second magnetic layer with a lower coercive field covering the first layer. Synchronous recording is done on the two layers so that all data is recorded on the second layer and some of the date is recorded on the first layer. Data on the second layer is validated upon reading by reading the data in the first layer after erasure of the second layer.
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