A server apparatus which retains a data file transferred from a predetermined user through a network and provides an access service for the data file through the network is disclosed, in which unauthorized access to the data file can be prevented with a low processing load. More specifically, the present invention relates to a semiconductor device which can reduce a leakage current and the power consumption in the standby state. In an assembled state, an axial groove is formed on an inner surface of the semicircular bearings so as to extend along the butt end throughout a full length between both axial ends of the semicircular bearing, whereby the axial groove, as a lubricant-oil flow channel, is connected with the circumferential groove. In addition, the invention increases the maximum size of the CLAW block for each channel operation. When the driven load is in a predetermined torque range, the positioning post is engaged in the cam groove, the output shaft is rotated by the input shaft and drives the driven load.