Data storage device measuring laser protrusion fly height profile
First Claim
1. A data storage device comprising:
- a disk comprising a plurality of tracks, where each track comprises a plurality of servo sectors and at least one data segment between consecutive servo sectors;
a head actuated over the disk, the head comprising a laser configured to heat the disk during write operations based on a laser power; and
control circuitry configured during a first revolution of the disk to;
first increase the laser power over a first interval to cause at least part of the head to protrude toward a first data segment of the disk; and
after the first interval, first decrease the laser power and read a fly height pattern from the first data segment to first measure a fly height of the head.
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Accused Products
Abstract
A data storage device is disclosed comprising a disk comprising a plurality of tracks, where each track comprises a plurality of servo sectors and at least one data segment between consecutive servo sectors. The data storage device further comprises a head actuated over the disk, the head comprising a laser configured to heat the disk during write operations based on a laser power. During a first revolution of the disk, the laser power is first increased over a first interval to cause at least part of the head to protrude toward a first data segment of the disk. After the first interval, the laser power is decreased and a fly height pattern is read from the first data segment to first measure a fly height of the head.
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Citations
20 Claims
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1. A data storage device comprising:
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a disk comprising a plurality of tracks, where each track comprises a plurality of servo sectors and at least one data segment between consecutive servo sectors; a head actuated over the disk, the head comprising a laser configured to heat the disk during write operations based on a laser power; and control circuitry configured during a first revolution of the disk to; first increase the laser power over a first interval to cause at least part of the head to protrude toward a first data segment of the disk; and after the first interval, first decrease the laser power and read a fly height pattern from the first data segment to first measure a fly height of the head. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating a data storage device, the method comprising during a first revolution of a disk:
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first increasing a laser power of a head over a first interval to cause at least part of the head to protrude toward a first data segment between consecutive servo sectors of the disk; and after the first interval, first decreasing the laser power and reading a fly height pattern from the first data segment to first measure a fly height of the head. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification