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Data storage device calibrating parameter for heat assisted magnetic recording

  • US 9,472,219 B1
  • Filed: 06/11/2015
  • Issued: 10/18/2016
  • Est. Priority Date: 05/01/2015
  • Status: Active Grant
First Claim
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1. A data storage device comprising:

  • a disk;

    a head actuated over the disk, wherein the head comprises a laser configured to heat the disk while writing data to the disk; and

    control circuitry configured to;

    (a) calibrate a write power for the laser, wherein the write power is applied to the laser while writing user data to the disk;

    (b) apply a calibration power to the laser for a first interval, wherein the calibration power is high enough to cause the head to contact the disk if applied for a second interval longer than the first interval;

    (c) while applying the calibration power to the laser, write test data to the disk during at least part of the first interval; and

    (d) read the test data from the disk to generate a read signal and generate a metric based on the read signal.

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