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Data storage device measuring radial offset between read element and write element

  • US 9,214,186 B1
  • Filed: 03/23/2015
  • Issued: 12/15/2015
  • Est. Priority Date: 03/23/2015
  • Status: Expired due to Fees
First Claim
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1. A data storage device comprising:

  • a disk comprising a plurality of tracks;

    a head actuated over the disk, the head comprising a read element radially offset from a write element; and

    control circuitry configured to;

    write a first pattern to a single track;

    read the first pattern from the single track to generate a first read signal;

    generate a first quality metric based on the first read signal;

    write a second pattern to the single track, wherein the second pattern is different from the first pattern;

    read the second pattern from the single track to generate a second read signal;

    generate a second quality metric based on the second read signal; and

    measure the radial offset of the read element and write element based on the first and second quality metrics.

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