Abstract
Dual stage actuator systems in Hard-Disk drives are used for high-capacity and high-speed seeking. This technology continuously controls dual actuators for the main positioner and for fine positioners in the dual stage servo system. Additionally, a current voice coil actuator is used for the main positioner and piezo actuators installed in the suspension are used for the fine positioner. The life span for an active piezo actuator effects the life span of HDD. In this report, we investigated the degradation factor of the piezo actuator then conducted the accelerated test with its factor. We also show the calculation method for the accelerated factor by Arrhenius equation and the life span prediction for the piezo under the operating conditions from the obtained data.
