Patent ID: 6847605

Claim:
A disk cartridge incorporating a disk-shaped recording medium and having an opening portion for carrying enabling a recording and/or reproducing operation by a recording and/or reproducing device, comprising: a disk cartridge main body; a disk holder which is detachably mountable to said disk cartridge main body; and a reverse insertion preventing structure for preventing said disk holder having a surface and a rear face from being inserted turning inside out into said disk cartridge main body when said disk holder is mounted to said disk cartridge main body; wherein said opening portion of the disk cartridge is provided in said disk cartridge main body; wherein said opening portion is closed by a shutter arranged at said disk cartridge main body such that said disk-shaped recording medium is shielded from outside by said shutter when the disk cartridge is outside of the recording and/or reproducing device; wherein when the disk cartridge is inside of the recording and/or reproducing device, said shutter is moved and said opening portion is opened such that the recording and/or reproducing device enables reproducing or recording from or to said disk-shaped recording medium; wherein said disk holder is mountable to said disk cartridge main body along with said disk-shaped recording medium; and wherein said disk holder is constituted by a structure which is detachable to outside of said disk cartridge main body along with said disk-shaped recording medium, said disk holder having two arms holding an outer periphery of said disk-shaped recording medium independent of any orientation of said disk holder and said disk-shaped recording medium when said disk holder holding said disk-shaped recording medium is detached outside of said disk cartridge.