Digital servo control method for disc drive

摘要

A servo control apparatus and method are capable of controlling the position of a head for recording digital data on a disk as recording medium and reading the digital data thereon. A digital servo control method controls a head driver for moving a head for reading servo information to a target track every predetermined sampling period in a data storage system using disk recording media including the servo information indicating a divisional position of a recording area. The method comprises the steps of detecting a current track position of the head in a current sampling period by determining information on a head position on a disk from the servo information, determining the current track position, an estimated speed in the next sampling period for moving to the target track by a control signal input to the head driver so that the head can be moved to the current track position, and an estimated position track of the head in the next sampling period, calculating a track interval between the target track and the estimated position track, and a target speed to move the head in correspondence with the interval, and calculating a difference value between the target speed and the estimated speed thereby to output a control signal corresponding to the difference value to the head driver. <IMAGE>