Patent ID: 7436612

Claim:
A storage apparatus that detects a servo sync mark written on a track of a disk-shaped recording medium to perform data input/output data with respect to the recording medium, the storage apparatus comprising: a calculating unit that calculates an interval time from a detection of a servo sync mark until a detection of an adjacent servo sync mark, for all servo sync marks on the track; a measuring unit that measures, based on the calculated interval time, a deviation amount between a link interval time that represents the interval time between a servo sync mark recorded first and a servo sync mark recorded last and an ideal interval time that represents the link interval time when all the servo sync marks on the track are written at equal intervals; and a correcting unit that corrects a timing for detecting the servo sync mark when performing the data input/output, by correcting the link interval time, with which the deviation amount is measured, using interval times before and after the link interval time.