Patent ID: 7889610

Claim:
A multi-layered information recording medium including a plurality of recording layers, wherein the multi-layered information recording medium is configured in a manner such that information can be optically recorded from one side of the multi-layered information recording medium into each of the plurality of recording layers, the multi-layered information recording medium comprising: a user data area for recording user data; a plurality of spare areas including at least one replacement region, wherein when the user data area includes at least one defect region, the at least one replacement region may be used in place of the at least one defect region; and a plurality of defect management areas including a plurality of disc definition structures which include information about defect management of the user data area, wherein the plurality of recording layers include a first recording layer and a second recording layer positioned contiguous to each other, the first recording layer includes a first spare area, a first user data area and a second spare area along a track path direction, the second recording layer includes a third spare area, a second user data area and a fourth spare area along a track path direction, the second spare area and the third spare area are positioned approximately at the same radial position on the multi-layered information recording medium, and the disc definition structure includes a plurality of spare area full flags respectively assigned to the first to fourth spare areas, each of which represents whether there is an available replacement region in the corresponding spare area, and wherein the disc definition structure includes first size information indicating a size of the first spare area, second size information indicating a size of the second spare area, third size information indicating a size of the fourth spare area and the spare area full flags, and the first size information, the second size information, the third size information and the spare area full flags are located in this order in the disc definition structure, wherein the second size information indicates both the size of the second spare area and a size of the third spare area.