Methods and apparatuses to accelerate scrolling for buffered windows. Reproducible crushing along with such low metal contamination that subsequent cleaning of the crushed polysilicon is not necessary are both obtained. The center of rotation of the moving portion is located at an optimal location relative to the center of mass of the moving portion, which results in cancellation of the two torque components and a secondary actuator that has essentially no resonant frequency in response to a seek by the primary actuator. The hole is provided in the board body. The gas flows into the radial bearing clearance between the shaft and the inner peripheral surface of the bearing housing, thereby the shaft is rotatably supported. In a further aspect of the present invention, the mobile communications device operates to mask the transmissions of these readers, to prevent them from reading the tags.