Disk drive calibrating laser power for heat assisted magnetic recording based on quality metric and track width

摘要

A disk drive is disclosed comprising a head actuated over a disk, wherein the head comprises a laser operable to heat the disk while writing data to the disk. A laser power of the laser is initialized, and a test pattern is written to the disk. The test pattern is read from the disk to generate a read signal, and a quality metric and a track width of the test pattern is measured based on the read signal. The laser power is adjusted and the process is repeated until at least one of the quality metric substantially matches a target value and the track width substantially matches a track width threshold.

主权项

1. A disk drive comprising:
a disk; a head actuated over the disk, wherein the head comprises a laser operable to heat the disk while writing data to the disk; and control circuitry operable to: a) initialize a laser power of the laser; b) write a test pattern to the disk; c) read the test pattern from the disk to generate a read signal; d) measure a quality metric of the read signal; e) measure a track width of the test pattern based on the read signal; f) adjust the laser power and repeat elements (b) through (f) until the track width substantially matches a track width threshold; and g) terminate the repeating in element (f) when the quality metric of the read signal substantially matches a target value.