DISC DRIVE WITH ROBUST TRACK FOLLOWING SERVO CONTROLLER

摘要

A servo system in a disc drive (110) provides robust servo control during track following operations. The disc drive (110) includesa rotatable disc (112) having a disc surface (180, 182) with information arranged in tracks on the disc surface (180, 182). The disc drive(110) also includes a transducer (144) for accessing the information on the disc surface (180, 182). An actuator arm (126) is operablycoupled to the transducer (144). An actuator (173) is operably coupled to the actuator arm (126) to move the transducer (144) relative tothe disc surface (180, 182) to follow one of the tracks during track following. A model-based servo controller (190) is operably coupledto the actuator (173) to control movement of the actuator (173). The model-based servo controller (190) provides robust track followingcontrol over a desired frequency range.