Patent ID: 8189441

Claim:
A method of recognizing a track pitch of an optical disk, adapted for an optical disk player, the optical disk player having a spindle motor and an optical pickup head, the spindle motor configured to rotate an optical disk, the optical pickup head configured to read the optical disk, the method comprising: driving the optical pickup head to a predetermined position so that the optical pickup head and an axis of the spindle motor is a predetermined distance apart; reading a data sector address at a single point on the optical disk; and recognizing a magnitude of the track pitch of the optical disk according to a value of the data sector address, wherein the track pitch is calculated by following equation: ID × d = π × [ ( n × d + r 0 ) 2 - r 0 2 ] l , in which ID is the data sector address on the optical disk, d is the track pitch, n is a number of tracks from a beginning track to a specific track, r 0 is a distance between a center position of an optical disk and a beginning position of the tracks, l is a length of each of the data sectors.