Disk drive performing lifetime logging of microactuator sensitivity
AssigneeWestern Digital Technologies, Inc.
InventorsYanning Liu, Chuanwen Ji, Duc T. Phan, Ming Ying Wang
Life of this patent
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Abstract
A disk drive is disclosed comprising a head, a disk surface, and a voice coil motor (VCM) and a microactuator operable to actuate the head over the disk surface. A sensitivity of the microactuator is periodically measured over a lifetime of the microactuator. Each measured sensitivity is stored in a timeline log, wherein the timeline log represents a degradation curve of the microactuator over the lifetime of the microactuator.
Claims24
A disk drive comprising:
- a head;
- a disk surface;
- a voice coil motor (VCM) and a microactuator operable to actuate the head over the disk surface;
- and
- control circuitry operable to:
- periodically measure a sensitivity of the microactuator over a lifetime of the microactuator;
- and
- store each measured sensitivity in a timeline log, wherein the timeline log represents a degradation curve of the microactuator over the lifetime of the microactuator.
A method of operating a disk drive, the disk drive comprising a head, a disk surface, and a voice coil motor (VCM) and a microactuator operable to actuate the head over the disk surface, the method comprising:
- periodically measuring a sensitivity of the microactuator over a lifetime of the microactuator;
- and
- storing each measured sensitivity in a timeline log, wherein the timeline log represents a degradation curve of the microactuator over the lifetime of the microactuator.
Dependencies are inferred from the claim text.