Disk drive calibrating defect threshold based on statistical quality metric measured for reference tracks

摘要

A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of data tracks. First data is written to a first data track, and the first data is read from the first data track to measure a first quality metric representing a recording quality of the first data. Second data is written to a second data track, and the second data is read from the second data track to measure a second quality metric representing a recording quality of the second data. The first and second quality metrics are processed to generate a first statistical quality metric. A first defect threshold is generated based on the first statistical quality metric, and at least part of the disk is scanned for defects based on the first defect threshold.

主权项

1. A disk drive comprising:
a disk comprising a plurality of data tracks; a head; and control circuitry operable to:
write first data to a first data track;read the first data from the first data track and measure a first quality metric representing a recording quality of the first data;write second data to a second data track;read the second data from the second data track and measure a second quality metric representing a recording quality of the second data;process the first and second quality metrics to generate a first statistical quality metric comprising an average of the first and second quality metrics;generate a first defect threshold by adding a margin to the first statistical quality metric; andscan at least part of the disk for defects based on the first defect threshold.