A disc drive unit capable of simply performing an opening and closing driving of shutters by rotation of an inner rotor of a disc cartridge using the inner rotor is provided. The portable shelter may be a tent. Accordingly, production cost of the hybrid compressor and the size thereof can be reduced, while a cooling function can be ensured even when the vehicle engine is stopped. The barrier may be used for treating and monitoring a zone of interest. When the donor component has been positioned in the void of the recipient member, the suture paths are aligned.