Runout calibration for disc drive system
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United States of America Patent
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Oct 24, 2000
Grant Date -
N/A
app pub date -
Apr 14, 1997
filing date -
Apr 14, 1997
priority date (Note) -
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status (Latency Note)
Importance
Abstract
The invention provides methods and apparatus for compensating for disc runout. In an exemplary embodiment, a data-storage device is provided which includes a rotatable disc and a data head for accessing the disc. The device includes a runout calibration system comprising positioning mechanics coupled to the head for moving the head relative to the disc. A servo loop incorporates the positioning mechanics and generates a drive signal used to control the positioning mechanics. A memory, having an input and an output coupled to the loop, is also provided for recording a plurality of samples of the drive signal. The memory then plays back those samples into the feedback loop at first periodic angular increments forming a calibrating drive signal.
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