Systems and methods for storage devices are presented. A non-rotating excitation element is electromagnetically coupled to a non-rotating receiver element. Every order may have associated design files and an order file. This provides that sufficient fastening force can be achieved with a simple configuration and the coupling status can be retained with a smaller force as compared with such a fastening force, and further, a recombination can be easily achieved even after a separation is made. A mounting member is attached to the rear face. The drawer also has a sensor for detecting the magnets on the carrier, and an eject button for manually ejecting the carrier.