Data storage device calibrating a laser power for heat assisted magnetic recording based on slope of quality metric
First Claim
Patent Images
1. A data storage device comprising:
- a disk;
a head actuated over the disk, the head comprising a laser configured to heat the disk while writing data to the disk; and
control circuitry configured to;
(a) adjust a laser power for the laser;
(b) write a pattern to a target track at the adjusted laser power;
(c) read the pattern from the target track to generate a read signal;
(d) amplify the read signal using a variable gain amplifier(e) generate a quality metric based on a setting for the variable gain amplifier;
(f) repeat blocks (a) through (e) at least once; and
(g) configure a write power for the laser based on a slope of the quality metric.
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Abstract
A data storage device is disclosed comprising a disk and a head actuated over the disk, wherein the head comprises a laser configured to heat the disk while writing data to the disk. The laser power is adjusted and a pattern is written to a target track at the adjusted laser power. The pattern is read from the target track to generate a read signal, and a quality metric is generated based on the read signal. The process is repeated at least once, and a write power for the laser is configured based on a slope of the quality metric.
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Citations
26 Claims
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1. A data storage device comprising:
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a disk; a head actuated over the disk, the head comprising a laser configured to heat the disk while writing data to the disk; and control circuitry configured to; (a) adjust a laser power for the laser; (b) write a pattern to a target track at the adjusted laser power; (c) read the pattern from the target track to generate a read signal; (d) amplify the read signal using a variable gain amplifier (e) generate a quality metric based on a setting for the variable gain amplifier; (f) repeat blocks (a) through (e) at least once; and (g) configure a write power for the laser based on a slope of the quality metric. - View Dependent Claims (2, 3, 4)
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5. A data storage device comprising:
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a disk; a head actuated over the disk, the head comprising a laser configured to heat the disk while writing data to the disk; and control circuitry configured to; (a) adjust a laser power for the laser; (b) write a first pattern to a target track at the adjusted laser power; (c) read the first pattern from the target track to generate a first read signal; (d) generate a first quality metric based on the first read signal; (e) write a second pattern to the target track at the adjusted laser power; (f) read the second pattern from the target track to generate a second read signal; (g) generate a second quality metric based on the second read signal; (h) generate a third quality metric based on the first quality metric and the second quality metric; (i) repeat blocks (a) through (h) at least once; and (j) configure a write power for the laser based on a slope of the third quality metric. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of operating a data storage device, the method comprising:
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(a) adjusting a laser power for a laser; (b) writing a pattern to a target track on a disk at the adjusted laser power; (c) reading the pattern from the target track to generate a read signal; (d) amplifying the read signal using a variable gain amplifier; (e) generating a quality metric based on a setting for the variable gain amplifier; (f) repeating blocks (a) through (e) at least once; and (g) configuring a write power for the laser based on a slope of the quality metric. - View Dependent Claims (15, 16, 17)
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18. A method of operating a data storage device, the method comprising:
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(a) adjusting a laser power for a laser; (b) writing a first pattern to a target track on a disk at the adjusted laser power; (c) reading the first pattern from the target track to generate a first read signal; (d) generating a first quality metric based on the first read signal; (e) writing a second pattern to the target track at the adjusted laser power; (f) reading the second pattern from the target track to generate a second read signal; (g) generating a second quality metric based on the second read signal; (h) generating a third quality metric based on the first quality metric and the second quality metric; (i) repeating blocks (a) through (h) at least once; and (j) configuring a write power for the laser based on a slope of the third quality metric. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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Specification