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Data storage device detecting media defects by writing opposite polarity test pattern

  • US 9,171,575 B1
  • Filed: 06/23/2014
  • Issued: 10/27/2015
  • Est. Priority Date: 06/23/2014
  • 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; and

    control circuitry configured to;

    write a first test pattern having a first polarity to a target track;

    read the first test pattern to generate a first read signal;

    overwrite the first test pattern with a second test pattern having a second polarity opposite the first polarity;

    read the second test pattern to generate a second read signal; and

    detect a defect in the target track based on the first read signal and the second read signal.

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