Head selectable servo notch filter and method for improving serv

Details Head selectable servo notch filter and method for improving serv Head selectable servo notch filter and method for improving serv

1997-08-28

2000-09-19

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

360 61, G11B 5035

Patent

active

061221252

ABSTRACT:
A notch filter for a disk drive servo system is disclosed having selectable filtering capability. Different servo notch filters for different heads in the actuator head stack are provided. The notch filters may be selected to remove different resonant modes associated with the different disk drive heads. Each of the plurality of notch filters is tuned to remove a resonant frequency associated with at least one magnetic head of the disk drive. In operation, a notch filter is selected to remove a resonant frequency associated with a magnetic head commanded to write or read data to or from the disk drive. The notch filter system includes a multiplexor for controlling the selection of the notch filters. The multiplexor receives commands from a servo processor to control the selection of a notch filter. Different notch filters can be utilized, including series tapped notch filters or parallel notch filters. The notch filters are run continuously to avoid transients resulting from initialization of the notch filters.

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Fiechtner et al., "Automated Custom Tuning Servo System For Hard File Manufacturing," IBM Technical Disclosure Bulletin, vol. 32, No. 8B, pp. 346-347 (Jan. 1990).
Palmer, "Automatic Notch Frequency Control for Servo Stabilization," IBM Technical Disclosure Bulletin, vol. 19, No. 10, pp. 3860-3862 (Mar. 1977).

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