The internal dimensions securely maintain a storejet Transcend 500GB disk. It is not necessary to remove the case of the disc (it is held by an elastic strap) 1- access to the switch is direct, and 2- the USB connection cable can be connected directly ( cable is easily stored in the net after use). So little manipulation: it opens with the zip, you plug the cable into the USB socket. After use: we arrange the cable in its housing and closing the zipper. Great!