Patent ID: 7268962
Filing Date: 2007-09-11
Classification: G11B

Abstract:
1. A disk drive comprising: a head which reproduces servo burst signals recorded on a disk medium; and a calculation unit which calculates a pitch of tracks constituted on the disk medium by utilizing a reproduction amplitude value of the servo burst signals which are output from the head, wherein the servo burst signals include respective servo burst signals which are a first set required to detect a first head position in a range of the tracks, and respective servo burst signals which are a second set required to detect a second head position in the range of the tracks, the second set not including the burst signals of the first set, the calculation unit calculates a pitch of the tracks by using a first reproduction amplitude value difference of the respective servo burst signals which are the first set and a second reproduction amplitude value difference of the respective servo burst signals which are the second set, and the calculation unit calculates a sum total of respective absolute values of the first and second reproduction amplitude value differences as the pitch of the tracks.