Data storage apparatus having servo control system
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United States of America Patent
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Oct 24, 1995
Grant Date -
N/A
app pub date -
Feb 7, 1995
filing date -
Mar 17, 1994
priority date (Note) -
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Abstract
Two-phase servo patterns are recorded on a servo area of a data medium of a data storage apparatus such that patterns Q+, N+, N- and Q- are recorded in the stated order, there being a phase shift of 90 degrees between position information N and position information Q.
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