Head Pad Positioning Control System for Hard Disk Drives
- 1 January 1994
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Translation Journal on Magnetics in Japan
- Vol. 9 (1) , 95-102
- https://doi.org/10.1109/tjmj.1994.4565800
Abstract
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 these servo systems to a hard disk drive, ±0.2ʼm head positioning accuracy and a 2.5 ms one-track seek time were achieved.Keywords
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