Data storage device measuring laser protrusion fly height profile

摘要

A data storage device is disclosed comprising a disk comprising a plurality of tracks, where each track comprises a plurality of servo sectors and at least one data segment between consecutive servo sectors. The data storage device further comprises a head actuated over the disk, the head comprising a laser configured to heat the disk during write operations based on a laser power. During a first revolution of the disk, the laser power is first increased over a first interval to cause at least part of the head to protrude toward a first data segment of the disk. After the first interval, the laser power is decreased and a fly height pattern is read from the first data segment to first measure a fly height of the head.

主权项

1. A data storage device comprising:
a disk comprising a plurality of tracks, where each track comprises a plurality of servo sectors and at least one data segment between consecutive servo sectors; a head actuated over the disk, the head comprising a laser configured to heat the disk during write operations based on a laser power; and control circuitry configured during a first revolution of the disk to:
first increase the laser power over a first interval to cause at least part of the head to protrude toward a first data segment of the disk; andafter the first interval, first decrease the laser power and read a fly height pattern from the first data segment to first measure a fly height of the head.