Patent ID: 7738327

Claim:
Device ( 1 ) for scanning an optical recording medium ( 3 ), comprising: an optical unit ( 5 ) for reading data from and/or writing data to said recording medium ( 3 ) by scanning said recording medium ( 3 ) with a radiation beam ( 21 ), said radiation beam ( 21 ) being positioned on said recording medium ( 3 ) in response to a tracking error signal, a tracking means ( 7 ) for generating said tracking error signal, a position control means ( 11 ) for controlling a radial scanning position of said radiation beam ( 21 ) in respect to a track on said recording medium ( 3 ), characterized in that said device ( 1 ) further comprises a calibration means ( 9 ) for determining a radial offset of said tracking error signal, said radial offset being obtained by tracking a first test track ( 45 ) of a test track area ( 23 ) on said recording medium ( 3 ) having asymmetric tracking conditions, and in that the position control means ( 11 ) is adapted for controlling the radial scanning position of said radiation beam ( 21 ) in respect to a track on said recording medium ( 3 ) using said tracking error signal and said radial offset, in case of asymmetric tracking conditions.