Disk drive employing comb filter for repeatable fly height compensation
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United States of America Patent
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Mar 29, 2011
Grant Date -
N/A
app pub date -
May 14, 2010
filing date -
May 14, 2010
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 disk drive further comprises a fly height actuator operable to adjust a fly height of the head. A fly height measurement (FHM) is generated for the head, and a fly height error (FHE) is generated as a difference between the FHM and a target fly height. A comb filter is used to generate fly height compensation values in response to the FHE, and a fly height control signal is generated in response to the FHE and the fly height compensation values, wherein the fly height control signal is applied to the fly height actuator.
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