Patent ID: 6650491
Filing Date: 2003-11-18
Classification: G11B

Abstract:
A RW offset setting method for setting RW offsets which occur between a write head and a read head in a disk device including a rotary actuator having both heads for accessing a disk recording medium, said RW offset setting method comprising the steps of:[A] recording a test pattern by said write head in each of a plurality of tracks to be measured, which is selected from among a plurality of tracks in said disk recording medium; [B] reading said test patterns by said read head at a plurality of different tracking positions for each of the plurality of tracks to be measured, and measuring an amplitude of a read back signal at each tracking position; [C] finding an approximate expression of a profile of the measured amplitude at each of said plurality of tracking positions for each of said plurality of tracks to be measured; [D] finding a tracking position that gives a maximum value of said approximate expression, of each of said plurality of tracks to be measured; and [E] based upon the tracking position found for each measured track, determining a plurality of coefficients of a track-dependent arithmetic expression by which a RW offset for a track in said disk device can be calculated.