DISK DRIVE CALIBRATING DYNAMIC FLY HEIGHT WRITE PROFILE FOR FLY HEIGHT ACTUATOR

摘要

A disk drive is disclosed comprising a disk and a head actuated over the disk, the head comprising a fly height actuator (FHA). The disk drive further comprises control circuitry including disk access circuitry, wherein during a calibration operation, the disk access circuitry is configured into a calibration mode that increases a heating of the head, and a fly height of the head is measured periodically to generate periodic fly height measurements that vary due to the heating of the head. A dynamic fly height (DFH) write profile is generated based on the periodic fly height measurements. During a write operation, the disk access circuitry is configured into a write mode and a DFH control signal is generated and applied to the FHA based on the DFH write profile.

主权项

1. A disk drive comprising:
a disk; a head actuated over the disk, the head comprising a fly height actuator; and control circuitry including disk access circuitry, the control circuitry operable to:
during a calibration operation, configure the disk access circuitry into a calibration mode that increases a heating of the head, and periodically measure a fly height of the head to generate periodic fly height measurements that vary due to the heating of the head;generate a dynamic fly height (DFH) write profile based on the periodic fly height measurements; andduring a write operation, configure the disk access circuitry into a write mode and generate a DFH control signal applied to the fly height actuator based on the DFH write profile,wherein the head further comprises a laser operable to heat the disk during the write operation, and the control circuitry is operable to configure the disk access circuitry into the calibration mode by applying a write power to the laser.