Drugs, in particular, pyrazole derivatives represented by the following general formula which have a calcium release-dependent calcium channel inhibitory effect and medicinal compositions, in particular, calcium release-dependent calcium channel inhibitors containing the above compounds as the active ingredient, 1. In a magnetic disk drive according to one embodiment, vibration of a headslider can be detected with a vibration sensor attached to a head support mechanism. The mounting members provide support for the wrists of the typist which allow pivotal movement of one and preferably both hands during typing, and also translational movement along the longitudinal axis of the track.