Disk drive correlating different fly height measurements to verify disk warpage
AssigneeWestern Digital Technologies, Inc.
InventorJames P. R. McFadyen
Life of this patent
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Abstract
A disk drive is disclosed comprising a disk surface, and a head actuated over the disk surface. A first fly height measurement is generated for the head over the disk surface by measuring a first metric, and a second fly height measurement is generated for the head over the disk surface by measuring a second metric different from the first metric. The first fly height measurement is verified by detecting a positive correlation in the first and second fly height measurements.
Claims14
A disk drive comprising:
- a first disk surface;
- a first head actuated over the first disk surface;
- and
- control circuitry operable to:
- generate a first fly height measurement for the first head over the first disk surface by measuring a first metric;
- generate a second fly height measurement for the first head over the first disk surface by measuring a second metric different from the first metric;
- and
- verify the first fly height measurement by detecting a positive correlation in the first and second fly height measurements.
A method of operating a disk drive comprising a first disk surface and a first head actuated over the first disk surface, the method comprising:
- generating a first fly height measurement for the first head over the first disk surface by measuring a first metric;
- generating a second fly height measurement for the first head over the first disk surface by measuring a second metric different from the first metric;
- and
- verifying the first fly height measurement by detecting a positive correlation in the first and second fly height measurements.
Dependencies are inferred from the claim text.