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US 9,099,144 B1Granted
Disk drive evaluating laser performance for heat assisted magnetic recording
AssigneeWestern Digital Technologies, Inc.
InventorsGalvin T. Chia, Prakash Balasubramaniam
Life of this patent
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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.
Claims28
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.
5 more elements
A method of operating a disk drive comprising:
- 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.
1 more element
Dependencies are inferred from the claim text.