Data storage device calibrating fly height actuator based on laser power for heat assisted magnetic recording
First Claim
1. A data storage device comprising:
- a disk;
a head comprising a laser configured to heat the disk while writing data to the disk;
a fly height actuator (FHA) configured to actuate the head vertically over the disk based on an FHA setting; and
control circuitry configured to;
calibrate a write laser power applied to the laser during a write operation;
measure a first fly height of the head at a first laser power setting;
measure a second fly height of the head at a second laser power setting different from the first laser power setting; and
generate a FHA write setting based on the calibrated write laser power and the first and second fly height measurements, where the FHA write setting is applied to the FHA during the write operation.
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Accused Products
Abstract
A data storage device is disclosed comprising a disk, a head comprising a laser configured to heat the disk while writing data to the disk, and a fly height actuator (FHA) configured to actuate the head vertically over the disk based on an FHA setting. A write laser power applied to the laser during a write operation is calibrated, a first fly height of the head is measured at a first laser power setting, and a second fly height of the head is measured at a second laser power setting different from the first laser power setting. A FHA write setting is generated based on the calibrated write laser power and the first and second fly height measurements, where the FHA write setting is applied to the FHA during the write operation.
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Citations
20 Claims
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1. A data storage device comprising:
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a disk; a head comprising a laser configured to heat the disk while writing data to the disk; a fly height actuator (FHA) configured to actuate the head vertically over the disk based on an FHA setting; and control circuitry configured to; calibrate a write laser power applied to the laser during a write operation; measure a first fly height of the head at a first laser power setting; measure a second fly height of the head at a second laser power setting different from the first laser power setting; and generate a FHA write setting based on the calibrated write laser power and the first and second fly height measurements, where the FHA write setting is applied to the FHA during the write operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating a data storage device, the method comprising:
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calibrating a write laser power applied to a laser to heat a disk during a write operation; measuring a first fly height of a head at a first laser power setting; measuring a second fly height of the head at a second laser power setting different from the first laser power setting; and generating a fly height actuator (FHA) write setting based on the calibrated write laser power and the first and second fly height measurements, where the FHA write setting is applied to a FHA to actuate the head vertically over the disk during the write operation. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification