In one embodiment, a removable storage module includes a bezel, and opposed first and second rails that extend from the bezel, the first rail including a key system component that is adapted to prevent full insertion of the module into a bay of a module cage so as to protect a connector of at least one of the module and the cage. The invention allows a user to interactively view, enter, and edit information on a transparent window. The conductive ring on the surface surrounds an opening of the conductive through hole on the surface and electrically connects to the conductive layer. API gravity is determined by correlation the wavelength of peak fluorescence and brightness of fluorescent emission of the sample. It is proposed that the locking device is provided for the purpose of unlocking the power supply unit from a locked state\u2014by means of a force which is exerted on the power supply unit and moves the entire power supply unit in relation to the accommodation region. Moreover, the digital data recordingreproducing method increases correction capability against several bytes to several tens bytes of errors generated at random without changing burst error correction length by performing this processing for respective PI codes by using interleave rules that are different as much as possible from one another.