A recording/reproducing device includes a drive device 303 for recording and reproducing information on and from a disc medium 100 and a recording/reproducing control circuit 305 for controlling operations of the drive device 303. The recording/reproducing control circuit 305 controls the drive device 303 such that medium identification information that enables the disc medium 100 to be distinguished from another disc medium is recorded repeatedly in a plurality of locations in an area where structural characteristic information of the disc medium is recorded within a management data area on the disc medium 100.