| 摘要 |
Method and apparatus for compensating for different gram loads and actuator arm resonances by positioning z-height of outer actuator arm at an optimum height. Specifically, an actuator arm driven by a closed loop servo motor system for a disc drive system is configured so that the outer upper and lower actuator arms are positioned at an optimum distance, called optimum z-height, from the disc surface. At the optimum z-height position, the resonances of the outer actuator arms are shifted as near as possible to the resonances of the inner actuator arms. At the optimum z-height, the gram loads on the head gimbal assemblies of the inner and outer actuator arms are closest for all z-heights measured. Accordingly, degradation of the performance of the servo motor system will be reduced.
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