Track-following and seek/settle control schemes for high density disk drives with dual-stage actuators

Advanced track following and seek/settle schemes for high density hard disk drives with dual-stage actuators are presented. A decoupled master-slave loop structure has been designed for a dual loop system with suspension based piezoelectric microactuators. Experiments show significant performance improvements of the dual-actuator system over the conventional single loop servo system. A new settle scheme for dual-stage servo system is also designed using a dual-loop initial value compensation (DIVC) scheme. Experimental results shown dramatic improvement of settle time using this new scheme.