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US 9,437,242 B1Granted
Data storage device employing different frequency preambles in adjacent data tracks
AssigneeWestern Digital Technologies, Inc.
InventorsThao Hieu Banh, Tom Sai-Cheung Chan, Chun Sei Tsai
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Abstract
A data storage device is disclosed comprising a disk comprising a plurality of data tracks each comprising a plurality of data sectors, and a head actuated over the disk. A first frequency preamble is written to a first data sector of a first data track and a second frequency preamble is written to a second data sector of a second data track, wherein the first frequency is different from the second frequency and the first data track is adjacent to the second data track.
Claims24
A data storage device comprising:
- a disk comprising a plurality of data tracks each comprising a plurality of data sectors;
- a head actuated over the disk;
- and
- control circuitry configured to write a first frequency preamble to a first data sector of a first data track and write a second frequency preamble to a second data sector of a second data track, wherein:
- the first frequency is different from the second frequency;
- and
- the first data track is adjacent to the second data track,
- wherein the control circuitry is further configured to:
- first read the first data sector to generate a first read signal;
- process the first read signal to recover data from the first data sector;
- and
- when the first read fails, execute a retry operation by at least:
- evaluating a frequency component of the first read signal corresponding to the first frequency preamble of the first data sector;
- generating a jog value based on the frequency component of the first read signal;
- and
- second reading the first data sector by offsetting the head away from the first data track based on the jog value.
13 more elements
A method of operating a data storage device, the method comprising:
- writing a first frequency preamble to a first data sector of a first data track on a disk and writing a second frequency preamble to a second data sector of a second data track on the disk, wherein:
- the first frequency is different from the second frequency;
- and
- the first data track is adjacent to the second data track,
- first reading the first data sector to generate a first read signal;
- processing the first read signal to recover data from the first data sector;
- and
- when the first read fails, executing a retry operation by at least:
- evaluating a frequency component of the first read signal corresponding to the first frequency preamble of the first data sector;
- generating a jog value based on the frequency component of the first read signal;
- and
- second reading the first data sector by offsetting a head away from the first data track based on the jog value.
9 more elements
A data storage device comprising:
- a disk comprising a plurality of data tracks each comprising a plurality of data sectors, wherein the data tracks are defined by a plurality of servo sectors each comprising servo bursts;
- a head actuated over the disk;
- and
- control circuitry configured to:
- write a first frequency preamble to a first data sector of a first data track and write a second frequency preamble to a second data sector of a second data track, wherein:
- the first frequency is different from the second frequency;
- and
- the first data track is adjacent to the second data track;
- execute a read operation of the first data track by at least:
- seeking the head to the first data track based on the servo sectors;
- settling the head onto the first data track based on a servo burst PES generated by reading the servo bursts in the servo sectors;
- reading the first data sector to generate a first read signal;
- evaluating a frequency component of the first read signal corresponding to the first frequency preamble of the first data sector;
- generating a preamble position error signal (PES) based on the frequency component;
- servoing the head over the first data track based on the preamble PES;
- and
- disabling the servo burst PES while reading at least part of the first data track.
14 more elements
A data storage device comprising:
- a disk comprising a plurality of data tracks each comprising a plurality of data sectors, wherein the data tracks are defined by a plurality of servo sectors each comprising servo bursts;
- a head actuated over the disk;
- and
- control circuitry configured to write a first frequency preamble to a first data sector of a first data track and write a second frequency preamble to a second data sector of a second data track, wherein:
- the first frequency is different from the second frequency;
- and
- the first data track is adjacent to the second data track;
- execute a read operation of the first data track by at least:
- reading the servo bursts of the servo sectors that define the first data track to generate a servo burst position error signal (PES);
- reading the first data sector to generate a first read signal;
- evaluating a frequency component of the first read signal corresponding to the first frequency preamble of the first data sector;
- generating a preamble PES based on the frequency component;
- and
- rewriting at least part of the first data track based on a difference between the servo burst PES and the preamble PES.
11 more elements
A method of operating a data storage device, the method comprising:
- writing a first frequency preamble to a first data sector of a first data track on a disk and writing a second frequency preamble to a second data sector of a second data track on the disk, wherein:
- the first frequency is different from the second frequency;
- and
- the first data track is adjacent to the second data track;
- executing a read operation of the first data track by at least:
- seeking a head to the first data track based on servo sectors that define the first data track;
- settling the head onto the first data track based on a servo burst PES generated by reading servo bursts in the servo sectors;
- reading the first data sector to generate a first read signal;
- evaluating a frequency component of the first read signal corresponding to the first frequency preamble of the first data sector;
- generating a preamble position error signal (PES) based on the frequency component;
- servoing the head over the first data track based on the preamble PES;
- and
- disabling the servo burst PES while reading at least part of the first data track.
10 more elements
A method of operating a data storage device, the method comprising:
- writing a first frequency preamble to a first data sector of a first data track on a disk and writing a second frequency preamble to a second data sector of a second data track on the disk, wherein:
- the first frequency is different from the second frequency;
- and
- the first data track is adjacent to the second data track;
- executing a read operation of the first data track by at least:
- reading the servo bursts of the servo sectors that define the first data track to generate a servo burst position error signal (PES);
- reading the first data sector to generate a first read signal;
- evaluating a frequency component of the first read signal corresponding to the first frequency preamble of the first data sector;
- generating a preamble PES based on the frequency component;
- and
- rewriting at least part of the first data track based on a difference between the servo burst PES and the preamble PES.
8 more elements
Dependencies are inferred from the claim text.