Disk drive measuring reader/writer gap by measuring fractional clock cycle over disk radius
First Claim
1. A disk drive comprising:
- a disk;
a head actuated radially over the disk, wherein the head comprises a read element separated from a write element by a reader/writer gap; and
control circuitry configured to;
synchronize a disk-locked clock to a rotation of the disk, wherein;
the disk-locked clock comprises a plurality of clock cycles; and
the reader/writer gap spans a first number of the clock cycles comprising an integer of the clock cycles plus a fraction of one of the clock cycles;
measure the fraction of one of the clock cycles when the head is positioned at a first plurality of radial locations across the disk; and
estimate a second plurality of radial locations where the fraction substantially equals a full one of the clock cycles.
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Accused Products
Abstract
A disk drive is disclosed comprising a disk, and a head actuated radially over the disk, wherein the head comprises a read element separated from a write element by a reader/writer gap. A disk-locked clock is synchronized to a rotation of the disk, wherein the disk-locked clock comprises a plurality of clock cycles, and the reader/writer gap spans a first number of the clock cycles comprising an integer of the clock cycles plus a fraction of one of the clock cycles. The fraction of one of the clock cycles is measured when the head is positioned at a first plurality of radial locations across the disk, and a second plurality of radial locations is estimated where the fraction substantially equals a full one of the clock cycles.
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Citations
10 Claims
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1. A disk drive comprising:
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a disk; a head actuated radially over the disk, wherein the head comprises a read element separated from a write element by a reader/writer gap; and control circuitry configured to; synchronize a disk-locked clock to a rotation of the disk, wherein; the disk-locked clock comprises a plurality of clock cycles; and the reader/writer gap spans a first number of the clock cycles comprising an integer of the clock cycles plus a fraction of one of the clock cycles; measure the fraction of one of the clock cycles when the head is positioned at a first plurality of radial locations across the disk; and estimate a second plurality of radial locations where the fraction substantially equals a full one of the clock cycles. - View Dependent Claims (2, 3, 4, 5)
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6. A method of operating a disk drive, the method comprising:
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synchronizing a disk-locked clock to a rotation of a disk, wherein; the disk-locked clock comprises a plurality of clock cycles; and a reader/writer gap of a head spans a first number of the clock cycles comprising an integer of the clock cycles plus a fraction of one of the clock cycles; measuring the fraction of one of the clock cycles when the head is positioned at a first plurality of radial locations across the disk; and estimating a second plurality of radial locations where the fraction substantially equals a full one of the clock cycles. - View Dependent Claims (7, 8, 9, 10)
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Specification