| 摘要 |
PROBLEM TO BE SOLVED: To provide a novel and improved method for determining a position error signal. SOLUTION: The method for determining the position error signal in a disk drive includes writing a servo signal that has a variable offset from a track center for a plurality of concentric tracks in a servo wedge on a disk surface, forming a spiral servo track, observing the offset values for the servo signal in the servo wedges at a first of the plurality of tracks, and observing the offset values for the servo signal in the servo wedges at a second of the plurality of tracks. The method also includes determining the first error amounts from the offset values at the first of the plurality of tracks, and determining the second error amounts from the offset values at the second of the plurality of tracks. If the first error amounts and the second error amounts are equal, one of the first or second error amounts is used as a correction update to a head non-linearity look-up table. COPYRIGHT: (C)2009,JPO&INPIT
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