Disk drive evaluating ratio of fly height setting for first and second heads to verify operability
AssigneeWestern Digital Technologies, Inc.
InventorPhillip S. Haralson
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Abstract
A disk drive is disclosed comprising a first head actuated over a first disk surface, and a second head actuated over a second disk surface. A first fly height (FH) setting is adjusted for the first head, and a second FH setting is adjusted for the second head. When a ratio of the first FH setting to the second FH setting exceeds a threshold, corrective action is taken.
Claims22
A disk drive comprising:
- a first head comprising a first fly height actuator operable to control a fly height of the first head over a first disk surface;
- a second head comprising a second fly height actuator operable to control a fly height of the second head over a second disk surface;
- and
- control circuitry operable to:
- adjust a first fly height (FH) setting for controlling the first fly height actuator;
- adjust a second FH setting for controlling the second fly height actuator;
- and
- when a ratio of the first FH setting to the second FH setting exceeds a first threshold, take corrective action.
A method of operating a disk drive, the disk drive comprising a first head comprising a first fly height actuator operable to control a fly height of the first head over a first disk surface, and a second head comprising a second fly height actuator operable to control a fly height of the second head over a second disk surface, the method comprising:
- adjusting a first fly height (FH) setting for controlling the first head fly height actuator;
- adjusting a second FH setting for controlling the second head fly height actuator;
- and
- when a ratio of the first FH setting to the second FH setting exceeds a first threshold, taking corrective action.
Dependencies are inferred from the claim text.