A motorcycle engine case comprises crankshaft support portions that are configured and adapted to support a crankshaft in a manner such that the crankshaft is rotatable about a crankshaft axis relative to the engine case. Then, when the magnetic field is provided to the magnetic substance fixedly holding the SIL which is floating, the movement operation to separate the SIL to the higher position than the height of the foreign material from the information reading surface together with the magnetic substance, is conducted. Each rough abrasive assembly is mounted on the base above the belt and has a rotating axle and an abrasive brush mounted around the rotating axle. The apparatus further comprises a second setting device for setting the number of allowable retries to play back data from said recording medium according to the transfer rate or the seek performance or the recording unit size.