| 摘要 |
A hard disc drive employs the self-servo-writing technique that writes practical servo signals on a hard disc based on the temporary servo signals written on the hard disc in advance, includes a holding mechanism that mechanically holds a rotary positioner, a memory which stores an eccentricity signal obtained while the holding mechanism is holding the rotary positioner, and a feedback compensator. The hard disc drive uses the stored eccentricity signal for a reference signal d*, calculates the difference between the reference signal d* and a head position signal x+d, obtains a positioner drive signal in the feedback compensator from the positional error based on the difference, and positions the magnetic head based on the positioner drive signal.
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