Patent ID: 7496805

Claim:
A write-once-type recording medium, comprising: a data area in which record data is recorded; a spare area in which the record data to be recorded or already recorded at a position of a defect in said data area is recorded; and a plurality of defect management areas in which defect management information including a defect list is recorded, the defect list indicating the position of the defect in said data area and a position in said spare area at which the record data to be recorded or already recorded at the position of the defect is recorded, said spare area being divided into a plurality of partial spare areas, said defect list being divided into a plurality of partial defect lists, each of the plurality of partial spare areas corresponding to respective one of the plurality of partial defect lists, index information being appended to at least one of the plurality of partial defect lists, the index information being for specifying other partial defect lists minimally required for constitution of the newest defect list with the one partial defect list, and a setup area being prepared in each of said defect management areas, the setup area being for recording all of the partial defect lists minimally required for the constitution of the newest defect list.