A disc library storage system and a disc cartridge thereof are provided. The disc library storage system includes a disc library, a disc drive tower, a disc transport device and a disc changing device. The disc library accommodates multiple discs. The disc drive tower accommodates multiple disc drives. The disc drives read data of the discs. The disc transport device moves the discs from the disc library to the disc drive tower and to the disc library. The disc changing device places a disc cartridge including an outer casing and a disc tray. The disc tray accommodates at least one replacement disc. The disc changing device has a pull-out state, in which the disc tray is received in the outer casing, and a close state, in which the disc tray is drawn from the outer casing and the disc transport device unloads the replacement disc from the disc tray.

A disc library storage system and a disc cartridge thereof are provided. The disc library storage system includes a disc library, a disc drive tower, a disc transport device and a disc changing device. The disc library accommodates multiple discs. The disc drive tower accommodates multiple disc drives. The disc drives read data of the discs. The disc transport device moves the discs from the disc library to the disc drive tower and to the disc library. The disc changing device places a disc cartridge including an outer casing and a disc tray. The disc tray accommodates at least one replacement disc. The disc changing device has a pull-out state, in which the disc tray is received in the outer casing, and a close state, in which the disc tray is drawn from the outer casing and the disc transport device unloads the replacement disc from the disc tray.

An optical disc apparatus includes: a controller configured to acquire information of an access result and access positions on an optical disc when an optical disc drive unit configured to optically access an optical disc optically accesses the optical disc; and a storage configured to store the information acquired by the controller.

An optical disc apparatus includes: a controller configured to acquire information of an access result and access positions on an optical disc when an optical disc drive unit configured to optically access an optical disc optically accesses the optical disc; and a storage configured to store the information acquired by the controller.

A conventional checking methodin which all of the optical disks are selected one by one from the plurality of optical disks stacked in a thickness direction and accommodated in a magazinetakes lots of time for checking. To solve the problem above, the optical disk device has a magazine, a disk drive, and a disk carrier device. The magazine accommodates a plurality of optical disks stacked in the thickness direction of the optical disks. The disk drive checks at least a recording surface facing an inner wall of the magazine of any optical disk of the optical disks accommodated in the magazine. Of the plurality of optical disks stacked and accommodated in the magazine, the disk carrier device takes out an optical disk positioned at an end in the thickness direction and whose recording surface faces the inner wall of the magazine, and carries it to the disk drive.