Electrolysis cell comprises, in one embodiment, a proton exchange membrane, an anode positioned along one face of the PEM, and a cathode positioned along the other face of the PEM. The fixture includes edge-lit flat panels that are configured andor overlayed to reproduce one or more desired images. The first handle-engaging member extends from a top end of the hollow body toward a bottom end of the hollow body. The force transmission element is formed as a roller chain and a movement direction of the belt buckle during driving is able to be provided by a guide element. Using the file processing method, the storage device can write one file into one disk of the RAID while ensuring security of file storage, thereby achieving a better energy saving effect when the file is read.