Patent ID: 8213278

Claim:
System comprising an optical disc and an apparatus including a pickup with a laser, a detector unit and an objective lens for reading data from the optical disc, the optical disc comprising a substrate layer and a data layer disposed on the substrate layer, the data layer having a mark/space data structure arranged in tracks being arranged in groups, which are separated each by a land section, and a group comprising an inner track, a center track and an outer track, the land section corresponding in width with a single empty track, wherein the tracks of the groups are arranged each as a spiral, the start of a track of a consecutive group beginning at a position corresponding with the end of a track of a preceding group, and the end of an outer track of a group corresponding with an angular and radial position of the beginning of an inner track of a subsequent group, the pickup provides a center beam for reading of data and for providing a second tracking signal and generates two satellite beams for providing a first and a third tracking signal, the three beams being arranged to be focused by the objective lens onto the optical storage medium and reflected light from the optical disc to be collected by the focus lens for guiding the collected light onto the detector unit, the two satellite beams have each a track offset of one track pitch with regard to the center beam, and the detector unit comprises a center detector for detecting reflected light from the center beam for reading of data and to generate the second tracking signal for tracking the pickup on the center track of the group and two satellite detectors for detecting reflected light from the satellite beams to generate the first tracking signal for tracking the pickup on the inner track of the group and to generate the third tracking signal for tracking the pickup on the outer track of the group.