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Head positioning control for low sampling rate systems based on two degree-of-freedom control

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4 Author(s)
Ishikawa, J. ; Functional Devices Res. Labs., NEC Corp., Kawasaki, Japan ; Yanagita, Y. ; Hattori, T. ; Hashimoto, M.

To enhance formatting efficiency in high density hard disk drives, it is desirable to decrease the number of embedded servo signals. As a consequence, the sampling rate of servo systems has been becoming lower. In this situation, it is difficult to attain fast track seeking by using only a feedback controller. This paper presents a high-speed track seek technique, based on two degree-of-freedom control. A new reference model is developed by focusing on the attainment of fast track seeking through the effective use of a voice coil motor, which functions as a disk head actuator. The model generates reference trajectories, allowing high-speed movement. Also, in order to quickly settle the disk head to a target track under various disturbances, an initial value compensation (IVC) method to minimize a quadratic performance index is developed. Experimental results, using a 3-1/2 inch hard disk drive, confirm the validity of the proposed method

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Magnetics, IEEE Transactions on  (Volume:32 ,  Issue: 3 )