Patent ID: 7580330

Claim:
An apparatus comprising: a center error creation circuit configured to generate a center error signal in response to a plurality of photo-diode signals; a lens controller circuit having a first input receiving said center error signal and a second input receiving a tracking error signal generated in response to said plurality of photo-diode signals, said lens controller circuit configured to adjust a position of a lens in a sled housing in response to said tracking error signal in a first mode and said center error signal in a second mode; a center error repeatable run out generation circuit having an input receiving said center error signal, said center error repeatable run out generation circuit configured to generate a center error run out signal and a center error measure signal in response to said center error signal, wherein said center error measure signal is generated by measuring said center error signal when said center error run out signal is in a peak phase; and a sled control circuit configured to control a step motor configured to move said sled housing, wherein in said first mode said sled control circuit controls said step motor in response to said center error measure signal and said center error run out signal to move said sled housing to center the lens within the sled housing.