Patent ID: 7656762

Claim:
A write-once-type recording medium including a plurality of recording layers, said write-once-type recording medium comprising in each recording layer: a data area to record therein the record data; a control information recording area, which includes a definite defect management area to record therein defect management information of said data area, to record therein information for controlling at least one of operations of recording and reading in said data area; and a plurality of shared areas, each of which is disposed between said control information recording area and said data area, to record therein evacuation data which is record data to be recorded at a position of a defect in said data area and to temporarily record therein the defect management information of said data area, the evacuation data being recorded with one predetermined point which exists in said shared area as a start point, the defect management information being recorded with another predetermined point which exists at a different point from the one point as a start point, in said shared area, wherein, each shared area is delimited by a first end and an opposite second end, the evacuation data is recorded from the first end towards the second end within an available area of the shared area defined between any previously recorded evacuation data and any previously recorded defect management information, the defect management information is recorded from the second end towards the first end within the available area of the shared area, and both the evacuation data and the defect management information is recordable in the available area of the shared area.