Optical disk device, optical-disk checking method and optical-disk checking program

An optical disk device comprising:

• a plurality of disk drives, each of the disk drives performing data-recording or data-readout on any of a plurality of optical disks;
• a plurality of magazines, each of the magazines accommodating the optical disks stacked in a direction of thickness of the optical disks;
• a magazine rack that accommodates the plurality of magazines;
• and
• a disk carrier device that selects any of the magazines from the magazine rack, selects any optical disk from the plurality of optical disks accommodated in the selected magazine and carries the selected optical disk to any of the plurality of disk drives,
• wherein, of the plurality of optical disks stacked and accommodated in the selected magazine, the disk carrier device carries an optical disk positioned at an end in the thickness direction and whose recording surface faces an inner wall of the magazine to any of the plurality of disk drives, any of the plurality of disk drives checks the recording surface of the optical disk carried by the disk carrier device, and while any of the disk drives is checking any of the optical disks, the disk carrier device carries another optical disk accommodated in one magazine to another disk drive.