| 摘要 |
The resonance of a hard disk drive using a notch filter is suppressed by detecting a resonance frequency after a far distance search is conducted, in a state in which the notch filter is disabled, and storing the detected resonance frequency as a start frequency, determining a coefficient of the notch filter to correspond to the start frequency and enabling the notch filter, detecting a resonance frequency after a far distance search is conducted, in a state in which the notch filter is enabled, and storing the detected resonance frequency as a target frequency, and changing the coefficient of the notch filter to correspond to the target frequency.
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