Patent ID: 7319643

Claim:
A reproducing apparatus comprising: an optical pickup to read data from an optical disk having a first reference signal and a second reference signal which are recorded to deviate from a center of a track in opposite directions and which have the same pattern; and a system controller which controls an orientation of the optical pickup relative to the optical disk to read the data from the optical disk by determining a first level Ivfo 1 of the first reference signal and a second level Ivfo 3 of the second reference signal from a reproducing signal reproduced from the optical disk, determining a balance value K 1 according to the following equation: K 1 =(Ivfo 1 −Ivfo 3 )/(Ivfo 1 +Ivfo 3 ), detecting a servo error based upon the balance value K 1 , controlling an orientation of the optical disk relative to an optical pickup using the detected servo error, and reproduces the data from the optical disk with respect to which the orientation is being controlled.