A gerotor motor has a housing located adjacent a port plate. In response to receiving the feedback signal, the telephone network performs a number of measurements on the system and related to the user device that can be analyzed to determine the problem, and potentially resolve the problem. A plurality of elongate waterstops are affixed to the waterproof membrane and arranged to form a plurality of compartments. As a result, resistive losses, which increase with increased temperature, are reduced. The engaging panels respectively engage the hard disk drive enclosure in response to the conversion enclosure being inserted and located into the hard disk drive enclosure. The display apparatus includes a display unit having a view angle-limiting filter on its surface, a rotary mechanism to rotate the display unit and a control unit which implements control so that when the display unit, rotated by the rotary mechanism, is faced to each of plural directions, the display unit displays a different textimage content associated with the direction.