Several robust control designs and configurations of control system used for track-following controllers of a dual stage hard disk drive are presented and compared. The use of dual stage actuator in hard disk drive system has become a means of achieving increased servo actuator bandwidth. The dual stage actuator presented here uses a voice-coil motor (VCM) as a coarse actuator and a piezoelectrifc actuator (PZT) as a fine actuator. LQG, LQG/LTR and H_infinity control problem are applied to the compensator designs of the dual stage hard disk drive. The results show that the precise track-following control can be realized by using these control systems.
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