Disk drive comprising a pattern dependent overshoot circuit for controlling write current overshoot
AssigneeWestern Digital Technologies, Inc.
InventorJai N. Subrahmanyam
Life of this patent
Estimating the term…
Abstract
A disk drive is disclosed comprising a disk and a head actuated radially over the disk. A pattern detector detects a predetermined pattern in write data to be written to the disk, and in response, adjusts a write current overshoot in a write current applied to the head.
Claims24
A disk drive comprising:
- (a) a disk;
- (b) a head actuated radially over the disk,
- (c) a disk controller for receiving user data from a host to be written to the disk, the disk controller for generating write data in response to the user data;
- (d) a write driver for generating a write current applied to the head in response to the write data and an overshoot control signal for controlling a write current overshoot in the write current;
- and
- (e) a pattern detector for adjusting the overshoot control signal in response to a predetermined pattern detected in the write data.
A pattern dependent overshoot circuit for controlling write current over shoot in a disk drive, the disk drive comprising a disk, a head actuated radially over the disk, and a disk controller for receiving user data from a host to be written to the disk, the disk controller for generating write data in response to the user data, the pattern dependent overshoot circuit comprising:
- (a) a write driver for generating a write current applied to the head in response to the write data and an overshoot control signal for controlling a write current overshoot in the write current;
- and
- (b) a pattern detector for adjusting the overshoot control signal in response to a predetermined pattern detected in the write data.
A method of writing write data in a disk drive, the disk drive comprising a disk and a head actuated radially over the disk, the method comprising the steps of:
- (a) modulating a write current in response to the write data;
- (b) detecting a predetermined pattern in the write data,
- (c) when the predetermined pattern is detected, adjusting a write current overshoot in the write current by an overshoot value to generate an adjusted write current;
- and
- (d) applying the adjusted write current to the head.
Dependencies are inferred from the claim text.