Disk drive implementing a read channel optimization process
AssigneeWestern Digital Technologies, Inc.
InventorsDouglas M. Boguslawski, Kameron Kam-Wai Jung
Life of this patent
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Abstract
A disk drive is disclosed comprising a disk including a plurality of tracks, a head actuated over the disk, and control circuitry. The control circuitry is operable to: write a target track including a plurality of data wedges; determine optimization metrics for the data wedges of the plurality of data wedges as the data wedges are read; store the optimization metrics for the data wedges from the target track; and remove a first portion and a second portion of the optimization metrics such that a remaining portion of the optimization metrics remains. Further, the control circuitry is operable to calculate an average optimization metric value for the remaining portion of optimization metrics for use in read channel optimization.
Claims18
A disk drive comprising:
- a disk comprising a plurality of tracks;
- a head actuated over the disk;
- and
- control circuitry operable to:
- write a target track including a plurality of data wedges;
- determine optimization metrics for the data wedges of the plurality of data wedges as the data wedges are read;
- store the optimization metrics for the data wedges from the target track;
- remove a first portion and a second portion of the optimization metrics such that a remaining portion of the optimization metrics remains, wherein the first portion of the optimization metrics removed is below the standard deviation of the optimization metrics and the second portion of the optimization metrics removed is above the standard deviation of the optimization metrics;
- and
- calculate an average optimization metric value for the remaining portion of optimization metrics for use in read channel optimization.
A method of optimizing read channel operation for a disk drive, the disk drive comprising a disk and a head actuated over the disk, the method comprising:
- writing a target track including a plurality of data wedges to the disk;
- determining optimization metrics for the data wedges of the plurality of data wedges as the data wedges are read;
- storing the optimization metrics for the data wedges;
- removing a first portion and a second portion of the optimization metrics such that a remaining portion of optimization metrics remains, wherein the first portion of the optimization metrics removed is below the standard deviation of the optimization metrics and the second portion of the optimization metrics removed is above the standard deviation of the optimization metrics;
- and
- calculating an average optimization metric value for the remaining portion of the optimization metrics for use in read channel optimization.
A disk drive comprising:
- a disk comprising a plurality of tracks;
- a head actuated over the disk;
- and
- control circuitry operable to:
- write a target track including a plurality of data wedges;
- determine optimization metrics for the data wedges of the plurality of data wedges as the data wedges are read;
- store the optimization metrics for the data wedges from the target track;
- remove a first portion and a second portion of the optimization metrics such that a remaining portion of the optimization metrics remains, wherein the first portion of the optimization metrics removed is approximately 15% of the highest value optimization metrics or wherein the second portion of the optimization metrics removed is approximately 15% of the lowest value optimization metrics;
- and
- calculate an average optimization metric value for the remaining portion of optimization metrics for use in read channel optimization.
A method of optimizing read channel operation for a disk drive, the disk drive comprising a disk and a head actuated over the disk, the method comprising:
- writing a target track including a plurality of data wedges to the disk;
- determining optimization metrics for the data wedges of the plurality of data wedges as the data wedges are read;
- storing the optimization metrics for the data wedges;
- removing a first portion and a second portion of the optimization metrics such that a remaining portion of optimization metrics remains, wherein the first portion of the optimization metrics removed is approximately 15% of the highest value optimization metrics or wherein the second portion of the optimization metrics removed is approximately 15% of the lowest value optimization metrics;
- and
- calculating an average optimization metric value for the remaining portion of the optimization metrics for use in read channel optimization.
Dependencies are inferred from the claim text.