| 摘要 |
PROBLEM TO BE SOLVED: To compensate for vibration that is encountered in a disk drive by first detecting a governing vibration frequency and then executing a two-step algorithm for constituting an optimum servo feedback solution. SOLUTION: A detection filter for scanning a positional signal over the frequency range of vibration is composed while a data storage is operating, amplitude related to frequency is recorded, it is judged whether the recorded amplitude exceeds a specific threshold or not, the corresponding frequency of vibration is detected accordingly, and the frequency of vibration is detected. A correction filter using a plurality of filter coefficients being determined as the function of the detection frequency of vibration is constituted, and the influence of the detection frequency of vibration for the positional signal is reduced. External and internal vibrations are targeted as vibration. When the correction filter is repeatedly involved, the filter state vector as initial filter conditions is refreshed periodically in response to output from the correction filter.
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