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Track measurement for data storage device

  • US 8,988,810 B1
  • Filed: 06/02/2014
  • Issued: 03/24/2015
  • Est. Priority Date: 04/16/2014
  • Status: Active Grant
First Claim
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1. A Data Storage Device (DSD), comprising:

  • a disk for storing data;

    a head for reading and writing data on the disk; and

    a controller configured to;

    control the head to write test data in a plurality of sectors in a test track on the disk;

    control the head to write an adjacent track on the disk that is offset from the test track by an offset distance;

    control the head to read data from the plurality of sectors in the test track from an Off-Track Read Capability (OTRC) position on the disk outside of the test track;

    determine an OTRC value for each sector of the plurality of sectors in the test track by varying the OTRC position and determining whether the sector meets a criterion for correctly reading data from the sector;

    calculate an average OTRC value for the plurality of sectors in the test track;

    calculate a standard deviation of the OTRC values for the plurality of sectors in the test track;

    determine whether the average OTRC value for the plurality of sectors is greater than or equal to a predetermined multiple of the standard deviation of the OTRC values for the plurality of sectors; and

    if it is determined that the average OTRC value is greater than or equal to the predetermined multiple of the standard deviation of the OTRC values, control the head to rewrite the adjacent track at a decreased offset distance.

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