The invention is an improved power transmission drive, for an internal combustion engine. When a user of the device requests access to the object, the server may authenticate the user and verify a trust identifier of the device, before sending to the device a ticket granting access to the key. Alternatively, a similar effect of surface void reduction can be obtained by specifying a barrier layer and a seed layer and setting a proportion of occupation of a coincidence site lattice boundary having a grain boundary Sigma value 3 to all crystal grain boundaries of a Cu wiring to 40% or higher. If the access network determines that the mobile station is located inside the repeater’s coverage area, it may also initiate a handover of the communication with the mobile station to the repeated wireless link. The barrier metal is used to form a conducting oxide layer or a conducting layer which stops the oxygen diffusion. The sensor, which is installed between the housing and the magnetic disk drive unit, detects an external force acting on the housing or a distortion caused in the housing by dint of the external force.