This review describes the present status, features and trend of mechanoelectrical technology in information processing machinery, which is called in Japan. In information processing machinery, such as storage and output devices, the transformation between spatially allocated recording data and time series electrical data is performed by a mechanical of a body with mass. The performance of such devices depends on the speed and precision of the mechanical motion. The key to realize high-speed and precise is here generally called positioning/tracking mechanism; it is further subdivided into four key mechanisms: the motion mechanism, constant speed mechanism, positioning mechanism and tracking mechanism. Their present levels of performance and basic design method are described. Explanation of current important problems and leading research related to these four key mechanisms and mechanical is also given. In the evolution of mechatronics in data processing machinery, miniaturization is an essential trend. Since this miniaturization results in a decrease in the signal-to-noise ratio of the mechanical motion, the reduction of uncontrolled vibration modes, friction force and wear is becoming more and more important, as the mechatronics evolves into micromechatronics.