Patent ID: 7248541

Claim:
An optical disk device comprising: an optical head which emits a laser light to an optical disk having a recording layer and receives a reflection light to carry out one of a recording process and reproduction process; a detecting unit which detects a distribution of a recorded region and an unrecorded region of the optical disk based on a reflection light received by the optical head; a control unit which controls the optical head so as to make access to a target position of a recording layer of the optical disk while avoiding the unrecorded region based on a distribution of a recorded region and an unrecorded region detected by the detecting unit; and wherein, in the case where the optical disk has a plurality of recording layers and the target position is in a second recording layer different from a first recording layer to which the optical head is currently positioned, and in the case where an access is made to the unrecorded region of the second recording layer when an interlayer jump is carried out at a currently accessed position, the control unit moves the optical head to a position of the first recording layer corresponding to a position at which the unrecorded region of the second recording layer does not exist, and then the optical head is jumped in an interlayer manner to be moved to the target position.