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As we know that the recording density is increasing at an impressive annual rate of 100%, and the access time is decreasing; very soon, the storage density of Harddisk drive will cross 1 Terra bit per square inch. The VCM actuator used in the conventional disk drives has hundreds of flexible resonances at high frequencies, which limit the increase of bandwidth and hence the positioning accuracy. In...
High track densities and short access times have been achieved using an H?? controller with a sector servo system. The authors studied the difference in control performance for a system designed using the weighted mixed-sensitivity problem and one designed using the four block problem. By designing a two-degrees-of-freedom controller using H2 optimal theory, fast seeking was realized. On applying...
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