Disk cartridge

A disk cartridge incorporating a disk-shaped recording medium and having an opening portion for carrying out a recording and/or reproducing operation by a recording and/or reproducing device;

• the opening portion being closable so that the disk-shaped recording medium is shielded from outside by a shutter arranged at the disk cartridge when the disk cartridge is outside of the recording and/or reproducing device, and when the disk cartridge is inside of the recording and/or reproducing device, the shutter is moved to a position where the opening portion is open so that the recording and/or reproducing device can carry out the reproducing or recording operation from or to the disk-shaped recording medium;
• and
• a disk holder being arranged at the disk cartridge for holding the disk-shaped recording medium, the disk holder being configured so as to be mountable to a disk cartridge main body along with the disk-shaped recording medium and detachable from the disk cartridge main body outside of the disk cartridge so that the disk holder holds the disk-shaped recording medium independent of any orientation of the disk holder and the disk-shaped recording medium when the disk holder is detached outside of the disk cartridge;
• wherein the disk holder holds information in respect of the disk-shaped recording medium, the information being presented in or by a recessed portion which is formed in a portion of the disk holder.