Disk drive evaluating laser performance for heat assisted magnetic recording
First Claim
Patent Images
1. A disk drive comprising:
- a disk;
a head comprising a laser configured to heat the disk while writing to the disk; and
control circuitry configured to;
write data to the disk using an operating laser power applied to the laser;
read the data from the disk to generate a first read signal; and
measure a ramp interval for an amplitude of the first read signal to ramp up to a first threshold.
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Abstract
A disk drive is disclosed comprising a disk and a head comprising a laser configured to heat the disk while writing to the disk. Data is written to the disk using an operating laser power applied to the laser, and then the data is read from the disk to generate a read signal. A ramp interval is measured for an amplitude of the first read signal to ramp up to a first threshold.
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Citations
28 Claims
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1. A disk drive comprising:
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a disk; a head comprising a laser configured to heat the disk while writing to the disk; and control circuitry configured to; write data to the disk using an operating laser power applied to the laser; read the data from the disk to generate a first read signal; and measure a ramp interval for an amplitude of the first read signal to ramp up to a first threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of operating a disk drive comprising:
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writing data to a disk using an operating laser power applied to a laser of a head, wherein the laser is configured to heat the disk while writing to the disk; reading the data from the disk to generate a first read signal; and measuring a ramp interval for an amplitude of the first read signal to ramp up to a first threshold. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification