Disk drive calibrating failure threshold based on noise power effect on failure detection metric

摘要

A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of tracks, wherein each track comprises a plurality of data sectors. A test pattern is written to at least one data sector in at least one track, and the test pattern is read from the disk to generate a noisy read signal comprising added noise. An estimated data sequence is detected from the noisy read signal, and an amplitude of the added noise is increased until a failure detection metric reaches a metric threshold. A failure threshold is generated based on the amplitude of the added noise when the failure detection metric reaches the metric threshold, and a failure condition of the disk drive is predicted based on the failure threshold.

主权项

1. A disk drive comprising:
a disk comprising a plurality of tracks, wherein each track comprises a plurality of data sectors; a head; and control circuitry operable to:
write a test pattern to at least one data sector in at least one track;read the test pattern from the disk to generate a noisy read signal comprising added noise;detect an estimated data sequence from the noisy read signal;increase an amplitude of the added noise until a failure detection metric reaches a metric threshold;generate a failure threshold based on the amplitude of the added noise when the failure detection metric reaches the metric threshold; andpredict a failure condition of the disk drive based on the failure threshold.