Data storage device calibrating parameter for heat assisted magnetic recording
First Claim
1. A data storage device comprising:
- a disk;
a head actuated over the disk, wherein the head comprises a laser configured to heat the disk while writing data to the disk; and
control circuitry configured to;
(a) calibrate a write power for the laser, wherein the write power is applied to the laser while writing user data to the disk;
(b) apply a calibration power to the laser for a first interval, wherein the calibration power is high enough to cause the head to contact the disk if applied for a second interval longer than the first interval;
(c) while applying the calibration power to the laser, write test data to the disk during at least part of the first interval; and
(d) read the test data from the disk to generate a read signal and generate a metric based on the read signal.
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Abstract
A data storage device is disclosed comprising a head actuated over a disk, wherein the head comprises a laser configured to heat the disk while writing data to the disk. A write power for the laser is calibrated, wherein the write power is applied to the laser while writing user data to the disk. A calibration power is applied to the laser for a first interval, wherein the calibration power is high enough to cause the head to contact the disk if applied for a second interval longer than the first interval. While applying the calibration power to the laser, test data is written to the disk during at least part of the first interval. The test data is read from the disk to generate a read signal, and a metric is generated based on the read signal.
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Citations
14 Claims
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1. A data storage device comprising:
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a disk; a head actuated over the disk, wherein the head comprises a laser configured to heat the disk while writing data to the disk; and control circuitry configured to; (a) calibrate a write power for the laser, wherein the write power is applied to the laser while writing user data to the disk; (b) apply a calibration power to the laser for a first interval, wherein the calibration power is high enough to cause the head to contact the disk if applied for a second interval longer than the first interval; (c) while applying the calibration power to the laser, write test data to the disk during at least part of the first interval; and (d) read the test data from the disk to generate a read signal and generate a metric based on the read signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating a data storage device, the method comprising:
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(a) calibrating a write power for a laser of a head, wherein the write power is applied to the laser while writing user data to a disk; (b) applying a calibration power to the laser for a first interval, wherein the calibration power is high enough to cause the head to contact the disk if applied for a second interval longer than the first interval; (c) while applying the calibration power to the laser, writing test data to the disk during at least part of the first interval; and (d) reading the test data from the disk to generate a read signal and generate a metric based on the read signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification