Recording disk cartridge

A recording disk cartridge comprising:

• a cartridge case;
• a plurality of flexible recording disk media integrally rotatably housed with a rotation axis within the cartridge case, the cartridge case comprising:
• a lower plate for configuring a lower wall parallel to a plurality of the recording disk media;
• an upper plate for configuring an upper wall parallel to a plurality of the recording disk media;
• a side wall extending between peripheries of the lower plate and the upper plate and comprising an opening;
• a lower rotor arranged inside and facing the lower plate;
• an upper rotor arranged inside and facing the upper plate;
• and
• a shutter for closing and opening the opening and providing a linkage between the lower rotor and the upper rotor,
• wherein the lower rotor and the lower plate comprise, at the peripheries thereof, an arched lower protrusion with the rotation axis and an arched lower groove with the rotation axis for slidingly fitting in the lower protrusion, and the upper rotor and the upper plate comprise, at the peripheries thereof, an arched upper protrusion with the rotation axis and an arched upper groove with the rotation axis for slidingly fitting in the upper protrusion, so as to provide rotational support of the lower rotor and the upper rotor by the lower plate and the upper plate, respectively, with the rotational axis.