Disk drive adjusting closed-loop fly height target based on change in open-loop fly height control signal
First Claim
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1. A disk drive comprising:
- a disk;
a head actuated over the disk, the head comprising a fly height actuator (FHA); and
control circuitry operable to;
measure a fly height of the head;
generate a closed-loop fly height control signal based on the measured fly height and a target fly height;
adjust the target fly height based on a delta generated based on a change in an environmental condition; and
generate an FHA control signal applied to the FHA based on the closed-loop fly height control signal.
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Abstract
A disk drive is disclosed comprising a head actuated over a disk, the head comprising a fly height actuator (FHA). A fly height of the head is measured, and a closed-loop fly height control signal is generated based on the measured fly height and a target fly height. The target fly height is adjusted based on a delta generated based on a change in an environmental condition, and an FHA control signal is applied to the FHA based on the closed-loop fly height control signal.
470 Citations
20 Claims
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1. A disk drive comprising:
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a disk; a head actuated over the disk, the head comprising a fly height actuator (FHA); and control circuitry operable to; measure a fly height of the head; generate a closed-loop fly height control signal based on the measured fly height and a target fly height; adjust the target fly height based on a delta generated based on a change in an environmental condition; and generate an FHA control signal applied to the FHA based on the closed-loop fly height control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating a disk drive comprising a head actuated over a disk, the head comprising a fly height actuator (FHA), the method comprising:
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measuring a fly height of the head; generating a closed-loop fly height control signal based on the measured fly height and a target fly height; adjusting the target fly height based on a delta generated based on a change in an environmental condition; and generating an FHA control signal applied to the FHA based on the closed-loop fly height control signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification