System and method for evenly distributing thermal exposure to disk in heat-assisted magnetic recording (HAMR)
AssigneeHGST Netherlands B.V.
InventorsQing Dai, Xing-Cai Guo, Cyril Guyot, Lidu Huang, Bruno Marchon, Erhard Schreck
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Abstract
A method of radially positioning a heat assisted magnetic recording (HAMR) head writes data to a first band, wherein a radial position of the HAMR head within each data track is defined by a positional bias and a track location. A determination is made regarding whether a threshold has been reached with respect to the first band. If the write threshold has been reached with respect to the first band, then the positional bias associated with the first band is modified to evenly distribute thermal exposure of data tracks in the first band.
Claims21
A method of radially positioning a heat assisted magnetic recording (HAMR) head, the method comprising:
- writing data to a first band, wherein a radial position of the HAMR head within each data track is defined by a positional bias and a track location;
- determining whether a threshold has been reached with respect to the first band;
- and
- modifying the positional bias associated with the first band if the threshold has been reached.
A servo positioning system for a heat-assisted magnetic recording (HAMR) system, the servo positioning system comprising:
- a servo position demodulator that generates feedback regarding radial position of a read head with respect to a data track within one of a plurality of bands;
- and
- a servo control processor that controls radial position of the read head based on a position command, a positional bias associated with the band being written, and the radial position feedback, wherein the servo control processor modifies the positional bias associated with one of the plurality of bands in response to a threshold being reached with respect to the band.
A heat-assisted magnetic recording (HAMR) system comprising:
- a magnetic media comprising of a plurality of bands, each band comprised of a plurality of data tracks;
- a heat-assisted read/write head;
- an actuator arm that supports the heat-assisted read/write head;
- a voice coil motor connected to the actuator arm that selectively locates the heat-assisted read/write head over a specified data track on the magnetic media;
- and
- a servo control processor that controls radial position of the read head based on a position command and a positional bias associated with each of the plurality of bands, wherein the servo control processor selectively modifies the positional bias associated with each of the plurality of bands to evenly distribute thermal exposure of the magnetic media.
Dependencies are inferred from the claim text.