Disk drive executing retry operation after adjusting jog value in response to gain control
AssigneeWestern Digital Technologies, Inc.
InventorsTom S. Chan, Chun Sei Tsai, Carl E. Barlow, Colin W. Morgan
Life of this patent
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Abstract
A disk drive is disclosed comprising a disk having a plurality of tracks, wherein each track comprises a plurality of data sectors. A head is actuated radially over the disk for generating a read signal. A first read of a data sector is performed while adjusting an amplitude of the read signal in response to a gain control setting. When an error occurs while attempting to first read the data sector, a first jog value is generated in response to the gain control setting. The head is served over the data sector in response to the first jog value, and a second read of the data sector is performed.
Claims18
A disk drive comprising:
- a disk comprising a plurality of tracks, wherein each track comprises a plurality of data sectors;
- a head actuated radially over the disk for generating a read signal;
- and
- control circuitry operable to:
- first read a data sector while adjusting an amplitude of the read signal in response to a gain control setting;
- and
- when an error occurs while attempting to first read the data sector:
- generate a first jog value in response to the gain control setting relative to a nominal gain control value;
- servo the head over the data sector in response to the first jog value;
- second read the data sector;
- and
- when the first read is successful, adjust the nominal gain control value.
A method of operating a disk drive, the disk drive comprising a disk having a plurality of tracks, wherein each track comprises a plurality of data sectors, a head actuated radially over the disk for generating a read signal, the method comprising:
- first reading a data sector while adjusting an amplitude of the read signal in response to a gain control setting;
- and
- when an error occurs while attempting to first read the data sector:
- generating a first jog value in response to the gain control setting relative to a nominal gain control value;
- serving the head over the data sector in response to the first jog value;
- second reading the data sector;
- and
- when the first read is successful, adjusting the nominal gain control value.
A disk drive comprising:
- a disk comprising a plurality of tracks, wherein each track comprises a plurality of data sectors;
- a head actuated radially over the disk for generating a read signal;
- and
- control circuitry operable to:
- first read a data sector while adjusting an amplitude of the read signal in response to a gain control setting;
- and
- when an error occurs while attempting to first read the data sector:
- generate a first jog value by averaging the gain control setting while reading the data sector to generate a gain control average and computing a gain control delta relative to a difference between the gain control average and a nominal gain control value;
- servo the head over the data sector in response to the first jog value;
- and
- second read the data sector.
A method of operating a disk drive, the disk drive comprising a disk having a plurality of tracks, wherein each track comprises a plurality of data sectors, a head actuated radially over the disk for generating a read signal, the method comprising:
- first reading a data sector while adjusting an amplitude of the read signal in response to a gain control setting;
- and
- when an error occurs while attempting to first read the data sector:
- generating a first jog value by averaging the gain control setting while reading the data sector to generate a gain control average and computing a gain control delta relative to a difference between the gain control average and a nominal gain control value;
- serving the head over the data sector in response to the first jog value;
- and
- second reading the data sector.
Dependencies are inferred from the claim text.