Method and apparatus for dynamically establishing pitch static attitude in hard disk drive
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorsRemmelt Pit, Mike Suk
Life of this patent
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Abstract
A hard disk drive dynamically establishes a pitch static attitude (PSA) of a slider as appropriate to be higher during load and unload and lower during operation. Also, the PSA may be dynamically established during operation as a function of slider radial position and/or internal disk pressure and/or fly height to adjust slider fly height and/or contact stability. A PSA bias mechanism such as a piezoelectric layer can be coupled to the slider suspension to bend the flexure of the suspension to achieve PSA adjustment.
Claims19
A hard disk drive, comprising:
- at least one rotatable disk;
- at least one slider juxtaposed with the disk;
- a suspension holding the slider;
- a pitch static attitude (PSA) bias mechanism coupled to the suspension to establish a PSA of the slider;
- and
- a controller actuating the PSA bias mechanism to establish a larger PSA during ramp unload operations than a PSA established during ramp load operations.
A hard disk drive (HDD) comprising:
- at least one slider;
- at least one pitch static attitude (PSA) bias mechanism coupled to the slider to turn the slider;
- and
- at least one controller acquiring the PSA bias mechanism to establish a first PSA during a first condition and a second PSA during a second condition, the second PSA being different from the first PSA, wherein the first condition is slider unload operations and the second condition is slider load operations, both PSAs being positive, the second PSA being smaller than the first PSA.
A data storage device, comprising:
- data storage means for storing data;
- data transfer means juxtaposed with the data storage means for communicating data therebetween;
- pitch static attitude (PSA) biasing means for establishing a PSA of the data transfer means;
- and
- logic means for actuating the PSA biasing means to establish a relatively large positive PSA of the data transfer means at least during at least one of:
- load, and unload, and a relatively small positive PSA during operation.
Dependencies are inferred from the claim text.