Position sunsitivity adjusting method for disk apparatus and a disk apparatus using the same
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United States of America Patent
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May 25, 1999
Grant Date -
N/A
app pub date -
Mar 24, 1997
filing date -
Jul 10, 1996
priority date (Note) -
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Abstract
A position sensitivity adjusting method for a disk apparatus and a disk apparatus using the same for adjusting an AGC (Automatic Gain Control) amplifier for amplifying a servo signal on a servo surface of a disk medium, involves positioning a servo head at a boundary of tracks on the servo surface. The method then includes setting a plurality of different adjustment values in the AGC amplifier, reading two position signals through the servo head for each adjustment value, and calculating a dispersion value of the position signals for each adjustment value. After the adjustment value for the AGC amplifier which provides the minimum dispersion value is acquired from the calculated dispersion values, the acquired adjustment value is set in the AGC amplifier. With the adjusting method, even when offset compensation for positioning the servo head at a track boundary is executed, a positioning error can be prevented.
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