To reduce the rotational power, an apparatus with a rotational body that is rotationally driven in a fluid-filled housing a rotational directing body is provided between the rotational body and the housing, which is rotatably supported coaxially with respect to the rotational body. In one aspect, a the sending IM client sends files under root directories of one or more file folders under a file directory one file folder after another. The smoothed segment is transformed to a natural coordinate system, thereby providing a transformed segment.