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Data storage device adjusting laser input power to compensate for temperature variations

  • US 9,025,421 B1
  • Filed: 10/08/2014
  • Issued: 05/05/2015
  • Est. Priority Date: 10/08/2014
  • 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;

    measure a temperature;

    generate a first input power based on a first function of the measured temperature, wherein the first function compensates for a temperature dependent output power of the laser;

    generate a second input power based on a second function of the measured temperature, wherein the second function compensates for a temperature dependent coercivity of the disk; and

    combine the first input power with the second input power to generate a write power applied to the laser while writing data to the disk.

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