Magnetic disk apparatus

Abstract

A disk system has a disk as a recording medium, and a disk recording/reproducing apparatus for recording and reproducing data by a head radially movable provided on a disk by a head moving mechanism, and the disk has a first region formed with a servo sector having servo information along a data track for recording and reproducing data on a disk, second regions having servo sectors having servo information along a servo track and of the number of magnification of integer number of the servo sectors in the first region, and the disk recording/reproducing apparatus has, position detecting section placed on the moving portion of the head moving mechanism for detecting the moving position of a head to output a position signal representing the head position in the radial direction of the disk, memory section for storing 'head follow-up information' for a servo track obtained from the position signal in the state that the head is positioned on the servo track, and section for controlling to follow up the head to the data track by using 'first track follow-up error information' obtained by servo information read from the servo sector immediately after the head is passed over the servo sector in the first region when the head is positioned on the data track, and using 'second track follow-up error information' of a difference between the follow-up information of the head to the data track obtained from the position signal and follow-up information stored in the memory section while the head is passed between servo sectors in the first region.