A clock tuning device and method for executing overclocking operations on plural elements disposed on a motherboard. The actual power consumption of each running thread during a given context switch interval is determined, and a predefined priority level is associated with each thread among the active threads based on the actual power consumption determined for the threads. The vent includes a vent opening with a flow area that can be adjusted to throttle inflation fluid flow through the vent. In one embodiment NACKs are transmitted at a higher power than ACKs, thereby reducing the chance of the primary station misinterpreting a NACK as an ACK. The hard coat film is excellent in the adhesion property between the hard coat layer and the substrate after heat treatment, and can restrain the gases generated in heat treatment. A head electrical connection disposed on the slider body is electrically connected to the fly height control electrode.