Optical disc library apparatus having magazine-disc association information, optical disc, and optical disc library system

An optical disc library apparatus comprising:

• one or more magazines configured to store a plurality of optical discs;
• a plurality of optical disc drives configured to perform recording or reproducing on or from the optical discs;
• a changer mechanism configured to perform loading or ejecting any of the optical discs stored in the magazine to or from any of the optical disc drives;
• and
• a controller configured to control the changer mechanism;
• wherein the magazine includes:
• optical disc specific ID information specifying each of the plurality of optical discs;
• and
• disc information specifying position of each of the plurality of optical discs in the magazine;
• wherein the controller compares:
• a first disk position of the optical disc in the magazine, which is determined with the optical disc specific ID information indicated by the disc information;
• and
• a second disk position of the optical disc in the magazine, which is determined with the optical disc specific ID information acquired by the disc drive;
• and
• the controller controls the changer mechanism to return the optical disc to original position when the first disk position and the second disk position are different at the comparison.