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Disk drive employing fly height calibration tracks to account for magnetic entropy and thermal decay

  • US 8,879,188 B1
  • Filed: 06/10/2011
  • Issued: 11/04/2014
  • Est. Priority Date: 08/23/2010
  • Status: Active Grant
First Claim
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1. A disk drive comprising:

  • a disk comprising a plurality of tracks including a first fly height calibration track and a second fly height calibration track;

    a head actuated over the disk;

    a fly height actuator operable to control a fly height of the head in response to a fly height control signal; and

    control circuitry operable to;

    when a refresh event is detected, write calibration data to the second fly height calibration track;

    after writing calibration data to the second fly height calibration track, read the first fly height calibration track in order to calibrate the fly height control signal applied to the fly height actuator; and

    after calibrating the fly height control signal, read the second fly height calibration track in order to recalibrate the fly height control signal applied to the fly height actuator.

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