Patent ID: 7944804
Filing Date: 2011-05-17
Classification: G11B

Abstract:
1. An optical disk recording method which is adapted to record information on an optical disk by a light beam incident to the disk in one direction, the disk having a plurality of rewritable recording layers including a first recording layer nearest to a plane of incidence of the light beam and a second recording layer distant from the plane of incidence, the method comprising the steps of: specifying a target recording layer where user data is to be recorded from the first and second recording layers; detecting whether the specified target recording layer is the second recording layer; setting, prior to recording the user data to a requested address in the second recording layer when the specified target recording layer is the second recording layer, a partial region of the first recording layer corresponding to a radial position that is the same as that of the requested address in the second recording layer, to a selected recording state of either a non-recorded state or a recorded state depending on a characteristic of the disk; and recording the user data to the requested address in the second recording layer specified as the target recording layer, wherein the step of setting the partial region to the selected recording state is arranged so that, when it is detected that the disk is provided to have a characteristic that a recording quality in the second recording layer deteriorates if a recorded area exists in the partial region of the first recording layer, data currently recorded in the partial region of the first recording layer is saved in a memory unit and the recorded data in the partial region is erased so that the partial region is set in the non-recorded state, and wherein the method further comprises a step of recording the saved data from the memory unit to the partial region of the first recording layer after the user data is recorded to the requested address in the second recording layer in the step of recording.