Dual-stage actuators sometimes have a serious problem that the driving force of microactuators excites VCM vibration. To avoid the problem, we designed a suspension-drive piezoelectric micro-actuator to have high resonant frequency and small mass. We installed the microactuator in one of Fujitsu's 3.5-inch commercial drives for evaluation of the dual-stage servo system. The dual-stage actuator system achieved the openloop crossover frequency of 4 kHz.