This invention has as its object to save labor time required for correction and adjustments when an error has occurred during either the recognition of input data or the process of the recognition result of an information processing apparatus which recognizes input data and outputs the recognition result. If the jitter value exceeds a prescribed threshold, a write strategy parameter having a comparatively small effect on the jitter value is adjusted, and subsequent data are written on the recording medium using the adjusted parameter. The apparatus may also include a sensing portion coupled to the movable portion, and the movable portion andor sensing portion may move in a direction normal to the substrate in response to a magnetic field.