PES linearization scheme for disk drive servo using small excitation bode measurements
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United States of America Patent
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Apr 9, 2002
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app pub date -
Aug 19, 1999
filing date -
Aug 19, 1999
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Abstract
A PES linearization scheme using small excitation bode measurements is provided to account for non-linearity characteristics during measurements of head element positions so to generate a more accurate read and write operation by a head element of a disk drive assembly. The PES linearization scheme of this invention provides making gain measurements as the head element moves across the track, and then integrating the result to get a relative PES profile. By then finding two points on the profile a known distance apart, we can multiply the profile by the appropriate gain factor to get an absolute PES profile. This profile can be then be used as a look up table to convert raw PES numbers into actual position.
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