Abstract: Hard-disk drive is one of the most important parts in the computer. A new type actuator with dual -track system controlled by a multilayer piezoelectric actuator has been designed and fabricated. The time dependence and frequency response of the driver are measured by laser detecting system and the performance of the actuator with hard-disk dual -track system is discussed on the basis of the characterization of the piezoelectric actuator and finite element method.

Key words: multilayer piezoelectric actuator, finite element method (FEM), computer hard-disk dual-track system, displacement