Data storage device calibrating fly height actuator based on read mode touchdown resistance of touchdown sensor
First Claim
1. A data storage device comprising:
- a disk;
a head comprising a touchdown sensor;
a fly height actuator (FHA) configured to actuate the head vertically over the disk based on an FHA setting; and
control circuitry configured to;
configure the data storage device into a read mode;
while in the read mode, adjust the FHA setting until the head contacts the disk and measure a touchdown read mode resistance of the touchdown sensor;
configure the data storage device into a write mode and adjust the FHA setting so the head is not contacting the disk;
while in the write mode, measure a non-touchdown write mode resistance of the touchdown sensor; and
estimate a write touchdown FHA setting that will cause the head to contact the disk while in the write mode based on the touchdown read mode resistance and the non-touchdown write mode resistance.
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Accused Products
Abstract
A data storage device is disclosed comprising a disk, a head comprising a touchdown sensor, and a fly height actuator (FHA) configured to actuate the head vertically over the disk based on an FHA setting. The data storage device is configured into a read mode, and while in the read mode, the FHA setting is adjusted until the head contacts the disk and a touchdown read mode resistance of the touchdown sensor is measured. The data storage device is configured into a write mode and the FHA setting is adjusted so the head is not contacting the disk. While in the write mode, a non-touchdown write mode resistance of the touchdown sensor is measured, and a write touchdown FHA setting that will cause the head to contact the disk while in the write mode is estimated based on the touchdown read mode resistance and the non-touchdown write mode resistance.
465 Citations
22 Claims
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1. A data storage device comprising:
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a disk; a head comprising a touchdown sensor; a fly height actuator (FHA) configured to actuate the head vertically over the disk based on an FHA setting; and control circuitry configured to; configure the data storage device into a read mode; while in the read mode, adjust the FHA setting until the head contacts the disk and measure a touchdown read mode resistance of the touchdown sensor; configure the data storage device into a write mode and adjust the FHA setting so the head is not contacting the disk; while in the write mode, measure a non-touchdown write mode resistance of the touchdown sensor; and estimate a write touchdown FHA setting that will cause the head to contact the disk while in the write mode based on the touchdown read mode resistance and the non-touchdown write mode resistance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of operating a data storage device, the method comprising:
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configuring the data storage device into a read mode; while in the read mode, adjusting a fly height actuator (FHA) setting until a head contacts a disk and measuring a touchdown read mode resistance of a touchdown sensor; configuring the data storage device into a write mode and adjust the FHA setting so the head is not contacting the disk; while in the write mode, measuring a non-touchdown write mode resistance of the touchdown sensor; and estimating a write touchdown FHA setting that will cause the head to contact the disk while in the write mode based on the touchdown read mode resistance and the non-touchdown write mode resistance. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification