A manual dental driving tool adapted to drive a dental implant into the jawbone of a patient. A plurality of terms x and y may be received, and each may be based on truncated terms s and t and the shifted C term. The medium of the present invention has characteristics that overwriting can be made at a high speed, the jitter of mark edge is small, mark length modulation recording can be made at a high density, and the formed mark is excellent in the stability with the lapse of time. The spare receiver sends communications to one or modems normally registered with the troubled receiver to determine if the mass de-registration event is the result of a failed receiver or a connection problem.