Patent ID: 7457081

Claim:
A recording disk cartridge comprising: a cartridge case comprising a plurality of flexible recording disk media being contained within in an integrally rotatable fashion; a lower plate forming a lower wall of the cartridge case, the lower wall being placed parallel to the recording disk media; one or more inner plates being fixed on the lower plate and being stacked and partitioning the recording disk media; and an upper plate being fixed on the inner plates, and forming an upper wall of the cartridge case, the lower plate comprising at least one of a shutter lock mechanism and a write protect switch mechanism, the shutter lock mechanism being for blocking a shutter from being opened, the write protect switch mechanism being for preventing data from being erased accidentally from the recording disk media wherein, the shutter opens or closes an opening through which a head of a disk drive accesses an interior of the cartridge case, and the shutter and the opening are formed on the cartridge case.