The high gain servo controller with complex zeros was proposed<sup>1</sup>. The controller can realize a much higher gain with the
same servo bandwidth. We applied the controller to Blu-ray disc drives, and confirmed decrease of servo error and
improvement of resistance to vibration. On the other hand, we observed the controller increased an overshoot of an initial
response. We applied the initial value compensation<sup>2</sup>, and confirmed suppression of the overshoot.