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, the first and second fly height measurements, and a first function representing a nominal FHA delta setting between a read touchdown FHA setting and a write touchdown FHA setting relative to a delta in a fly height of the head due to a corresponding change in laser power applied to the laser, where the FHA write setting is applied to the FHA during the write operation.
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Abstract
A data storage device is disclosed comprising a disk, a head comprising a laser, and a fly height actuator (FHA) configured to actuate the head vertically over the disk based on an FHA setting. 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. A FHA write setting is generated based on a calibrated write laser power, the first and second fly height measurements, and a first function representing a nominal FHA delta setting between a read touchdown FHA setting and a write touchdown FHA setting relative to a delta in a fly height of the head due to a corresponding change in laser power applied to the laser, where the FHA write setting is applied to the FHA during the write operation.
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Citations
10 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, the first and second fly height measurements, and a first function representing a nominal FHA delta setting between a read touchdown FHA setting and a write touchdown FHA setting relative to a delta in a fly height of the head due to a corresponding change in laser power applied to the laser, where the FHA write setting is applied to the FHA during the write operation. - View Dependent Claims (2, 3, 4, 5)
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6. A method of operating a data storage device, the method comprising:
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calibrating a write laser power applied to a laser of a head during a write operation; measuring a first fly height of the head over a disk 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, the first and second fly height measurements, and a first function representing a nominal FHA delta setting between a read touchdown FHA setting and a write touchdown FHA setting relative to a delta in a fly height of the head due to a corresponding change in laser power applied to the laser, where the FHA write setting is applied to the FHA during the write operation. - View Dependent Claims (7, 8, 9, 10)
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Specification