Abstract: An optical disk adapter can position a deformed CD at a predetermined position in a disk-transferring tray by a very simple operation, and is simple in structure and easy in manufacture. At the central portion of an adapter main body (1a) having an external periphery with the same diameter as a 12 cm-CD, a positioning true circular central aperture (2) in which a square CD (C1) with an 8 cm-diagonal length can be fitted in a non-restricted state is provided. The center of this positioning true central aperture (2) is concentric with the center of the adapter main body (1a). The adapter main body (1a) is provided with a rotation prevention protrusion (3) against the disk-transferring tray (71) at the lower surface thereof and a disk clamper passing dented portion (4) at the upper surface thereof.

Abstract: A label printer suitable for label printing of a name card type optical disk as well as a 12 cm-standard complete round disk, wherein a 12 cm-diameter complete round disk loading recessed portion 3 is provided in a disk transferring tray 2 allowed to be inserted and ejected from a printer body 1, and a name card type disk loading recessed portion 4 having a bottom surface positioned lower than the bottom surface of the complete round disk loading recessed portion 3 is provided at the rear portion of the complete round disk loading recessed portion 3. At a rear portion of the name card type disk loading recessed portion 4, an aperture for allowing the movement of the tip protruded portion 11a of a disk holding means 11 in the fore-and-aft direction of the printer body 1 is provided.