Patent ID: 8599667

Claim:
A multi-layer optical recording medium having n recording layers (n≧3) in which recording and reproduction of information are carried out by laser light, the multi-layer optical recording medium comprising: a first file system area configured to be disposed in a first recording layer near a first logical address in an area used as a logical address space in which user data is recorded; and a second file system area configured to be disposed in the n-th recording layer near a last logical address in an area used as the logical address space, wherein the first file system area and the second file system area are reserved for recording of a file system which occurs prior to recording of the user data, wherein the first recording layer is a furthest layer from a viewpoint of a laser light incident surface side, and the n-th recording layer is a closest layer to the laser light incident surface side, wherein the logical address space is formed from the first logical address in the first recording layer to the last logical address in the n-th recording layer, and wherein (i) in the other recording layers different from the recording layer in which the second file system area is disposed, the logical address space is not allocated to an area overlapping with the second file system area in a layer stacking direction, and (ii) in the first recording layer the first file system area is disposed so as to overlap the logical address space in all other recording layers in the layer stacking direction.