Patent ID: 6795266
Filing Date: 2004-09-21
Classification: G11B

Abstract:
A magnetic disk unit which rotates a disk-shaped magnetic recording medium having a reference track and plural data tracks with a motor which generates an index signal at a predetermined position, and which records or reproduces data by employing a magnetic head, said magnetic disk unit comprising:a head moving means for slightly moving the magnetic head in the direction of the radius of the disk-shaped magnetic recording medium in a predetermined unit of a distance that is shorter than the data track width; a reproduction output amplitude measuring means for measuring the reproduction output amplitude of a signal read from a data track on the disk-shaped magnetic recording medium by the magnetic head every time the index signal is generated; and a CPU operable to obtain a position where the reproduction output amplitude has the maximum value based on the reproduction output amplitude measured by said reproduction output amplitude measuring means and the number of head movements of the magnetic head as moved by said head moving means so as to perform control of data track positioning of the magnetic head on the data track.