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US 10,217,481 B1Granted
Data storage device employing low duty cycle square wave to detect head touchdown
AssigneeWestern Digital Technologies, Inc.
InventorsShaomin Xiong, Na Wang, Robert Smith, Sripathi V. Canchi
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Abstract
A data storage device is disclosed comprising a head actuated over a disk, wherein the head comprises a fly height actuator (FHA). An FHA control signal is applied to the FHA, wherein the FHA control signal comprises a rectangular wave having a duty cycle in the range of ten percent to thirty percent. While applying the FHA control signal to the FHA, the head touching down onto the disk is detected.
Claims20
A data storage device comprising:
- a disk;
- a head actuated over the disk, wherein the head comprises a fly height actuator (FHA);
- and
- control circuitry configured to:
- apply a FHA control signal to the FHA, wherein the FHA control signal comprises a rectangular wave having a duty cycle in the range of ten percent to thirty percent;
- and
- while applying the FHA control signal to the FHA, detect the head touching down onto the disk.
4 more elements
A method of operating a data storage device, the method comprising:
- actuating a head over a disk, wherein the head comprises a fly height actuator (FHA);
- applying a FHA control signal to the FHA, wherein the FHA control signal comprises a rectangular wave having a duty cycle in the range of ten percent to thirty percent;
- and
- while applying the FHA control signal to the FHA, detecting the head touching down onto the disk.
1 more element
Dependencies are inferred from the claim text.