Disk drive servo system for eccentricity compensation and...

Details Disk drive servo system for eccentricity compensation and... Disk drive servo system for eccentricity compensation and...

2006-05-09

2006-05-09

Edun, Muhammad (Department: 2656)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S124130, C369S124010, C369S044340

Reexamination Certificate

active

07042827

ABSTRACT:
A disk drive servo system for eccentricity compensation and a method thereof includes an error detector detecting a position error between an actual position and a predetermined nominal reference position of a turntable actuator, a feedback unit generating and outputting a first control value to compensate for the position error received from the error detector, a learning controller calculating, storing, and outputting a second control value to compensate for eccentricity at one or more predetermined speeds of the disk drive, and a gain/phase adjustor providing gain and phase compensation information corresponding to the second control value of the learning controller according to frequency response characteristics of the turntable actuator at the one or more predetermined speeds. Accordingly, the eccentricity of the turntable actuator can be effectively compensated, thereby improving a lead-in performance, a tracking performance, and a high-speed seeking performance of the disk drive servo system with respect to the disk eccentricity.

REFERENCES:
patent: 5550685 (1996-08-01), Drouin
patent: 5892742 (1999-04-01), Yamashita et al.
patent: 6417983 (2002-07-01), Yatsu
patent: 2000-339729 (2000-12-01), None

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