An information processor such that interfaces mounted in the side faces of the main body of the information processor can be effectively used, and the connectability of an expanded device is excellent. Methods include monitoring actual performance of a production system that includes a plurality of machines. The cooling fluids may form vortices in the cooling channels before being released from the turbine blade through gill holes. Each memory device connects to an inlet selector and a corresponding transposed outlet selector. The anti-skate algorithm prevents skating during close of the tracking servo system by allowing the tracking servo system to close on a tracking error signal with an appropriate slope.