Digital servo control system for use in disk drives
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United States of America Patent
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Feb 12, 2002
Grant Date -
N/A
app pub date -
May 3, 1999
filing date -
Sep 18, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A digital servo control system for disk drives is an 'embedded' system--one in which servo control information is embedded on the same disk surface as the user data. In contrast to known embedded-servo systems in which a space-consuming series of many dibit pairs is present, the present system provides only a single dibit pair in a fractional positional error (PES.sub.F) area. Thus, the disk drive's read head encounters only a single dibit pair per sample period (or per data sector), thus saving valuable disk space that may be used for user data. Various pre-processing methods may be provided so as to pre-process the measurement derived from the single dibit pair per sample period (or data sector), so as to compensate for non-ideal characteristics of the dibit measurement. The system thus provides an accurate and robust servo control system, while sacrificing a minimum amount of valuable disk space to the servo information field.
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