Apparatus and method for determining the position of a transducer relative to a disk surface in a disk drive system
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United States of America Patent
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Feb 4, 1997
Grant Date -
N/A
app pub date -
May 10, 1995
filing date -
May 10, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and system for generating a position signal indicative of the position of a transducer with reference to a fixed reference point on the surface of a disk within a disk drive system. The system is comprised of two major elements. The first element is a disk divided into sectors and has Z data tracks where each sector includes a preamble area that includes a servo band comprised of 0.75*Z consecutive overlapping quadrature servo patterns and gray scale band comprised of 1.5*Z consecutively addressed gray scale areas that have been recorded across all data tracks. The second element is a position generator that generates the position signal from the relative magnitude of each of the four servo bursts of a quadrature servo pattern of the servo band and the gray scale address of the gray scale area of the gray scale band that is read by a transducer when the transducer reads the preamble of a sector.
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