Patent ID: 6490119
Filing Date: 2002-12-03
Classification: G11B

Abstract:
A servo loop in a disc drive for positioning a head over a disc while maintaining servo loop stability, the servo loop comprising:an actuator-head assembly comprising the head, a large scale actuator and a micro actuator, both the large scale actuator and the micro-actuator being capable of moving the head over the disc, and the head being capable of generating a position value based on its location over the disc; a micro-actuator controller capable of generating a micro-actuator control value for driving the micro-actuator based on a position error value; an anti-windup compensation component coupled to the micro-actuator controller and capable of generating a saturation tracking error based on the micro-actuator control value; and a summing component capable of combining at least the position value from the head and the saturation tracking error to form the position error value that is provided to the micro-actuator controller.