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This paper proposes filtering methods to cancel the impulsive disturbance contained in position error signal (PES) in hard disk drives (HDDs). The impulsive disturbances may be observed as a few single sudden changes or some consecutive changes in PES. The filtering includes impulsive disturbance identification and estimation. A recursive method is used to determine the dynamic boundaries for identification...
We investigated the quantization effect on the servo performance of a 1.8-in hard disk drive by changing the bits of the proposed quantizer model. We measured and analyzed the frequency response of the quantizer with different bits. The corresponding error rejection functions show that the poor rejection ability of the servo loop to low-frequency disturbances is caused by the quantizer in addition...
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