Disk drive calibrating threshold and gain of touchdown sensor
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United States of America Patent
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Nov 18, 2014
Issued Date -
N/A
app pub date -
May 9, 2013
filing date -
May 9, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of tracks. The head comprises a touchdown element operable to generate a touchdown signal. The touchdown signal is amplified by a gain to generate an amplified touchdown signal, and a touchdown event is detected by comparing the amplified touchdown signal to a threshold. During a calibration operation, the gain is adjusted and the threshold is adjusted until the amplified touchdown signal does not exceed the threshold. During a normal operation, the touchdown event is detected based at least partly on the adjusted gain and the adjusted threshold.
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