DEVICE AND METHOD FOR SCANNING AN OPTICAL RECORDING MEDIUM AND OPTICAL RECORDING MEDIUM

摘要

The present invention relates to a 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 and 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). In order to provide a device (1) which allows a reliable tracking even in cases of asymmetric tracking conditions it is proposed 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, wherein 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. The invention further relates to a corresponding method for scanning an optical recording medium (3), a corresponding optical recording medium (3) and a corresponding computer program.