Head positioning in storage system during periods of inactivity
First Claim
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1. A magnetic disc storage system for storing magnetically encoded information, comprising:
- a magnetic disc having a disc surface for carrying the magnetically encoded information on a plurality of annular tracks including an outer track of maximum radius, the disc surface further including an annular textured zone and a dither region interposed between and spaced apart from the annular textured zone, and the outer track;
a spindle motor coupled to the disc to thereby cause rotation of the disc;
a head proximate the disc surface adapted for flying over the disc surface as the disc rotates and providing a readback signal in response to the magnetically encoded information;
an actuator coupled to the head to move the head in a radial direction thereby moving the head over the plurality of tracks and the textured zone;
readback circuitry coupled to the readback signal for processing the readback signal and providing an information output;
dither circuitry coupled to the actuator to periodically move the head over different tracks in the dither region while avoiding the textured zone during periods of inactivity.
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Abstract
A magnetic disc storage system includes a magnetic storage disc and a transducing head. During periods of inactivity the transducing head is dithered whereby the head is moved to tracks on the disc according to a number of criteria. The criteria includes wear reduction, power reduction, avoidance of textured zones, head cycling, increased fly height and clearing of debris carried on the head.
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Citations
17 Claims
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1. A magnetic disc storage system for storing magnetically encoded information, comprising:
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a magnetic disc having a disc surface for carrying the magnetically encoded information on a plurality of annular tracks including an outer track of maximum radius, the disc surface further including an annular textured zone and a dither region interposed between and spaced apart from the annular textured zone, and the outer track; a spindle motor coupled to the disc to thereby cause rotation of the disc; a head proximate the disc surface adapted for flying over the disc surface as the disc rotates and providing a readback signal in response to the magnetically encoded information; an actuator coupled to the head to move the head in a radial direction thereby moving the head over the plurality of tracks and the textured zone; readback circuitry coupled to the readback signal for processing the readback signal and providing an information output; dither circuitry coupled to the actuator to periodically move the head over different tracks in the dither region while avoiding the textured zone during periods of inactivity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of controlling movement of a head over a disc surface in a magnetic disc storage system, comprising:
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a) detecting a period of inactivity; b) repeatedly, periodically moving the head to different tracks in a dither region disposed between and spaced from a first track of minimum radius on the disc surface and a second track of maximum radius on the disc surface during the period of inactivity. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification