Shock detector in a disk drive servo control system
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United States of America Patent
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May 1, 2001
Grant Date -
N/A
app pub date -
Jul 14, 1998
filing date -
Jul 14, 1998
priority date (Note) -
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Abstract
A direct access storage device (DASD) servo control system detects a servo pattern recorded in multiple cells of a servo sector and compares the cell-to-cell readback signal independently of the position error signal (PES). A servo sector of the disk contains multiple servo identification cells such that a servo readback signal is generated for each cell. If the servo signal data from two successive cells of a single sector, or from the same cell of successive sectors, differs by an amount greater than a predetermined error threshold, then a physical jarring or shock is indicated and the servo control system causes a write inhibit command to the write channel.
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