Error recovery data storage system and method with two position read verification
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United States of America Patent
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-
Oct 4, 1994
Grant Date -
N/A
app pub date -
May 19, 1993
filing date -
May 19, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A direct access storage device (DASD) system uses a read/write head having a wide transducer write element and a narrow magneto-resistive read element. In order to avoid mistakenly reading a incompletely erased old data field, the system uses a verification procedure. Data are read at two positions along the data track which are separated by a radial distance D. This distance D is selected to be greater than the width of any incompletely erased data record. If the data read at the two read positions are equal, then the data are deemed to be correct and are sent to a host system.
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