Method of adaptive differential pulse code modulation, ADPCM, which fundamentally satisfies the recommendations G. The article storage structure for a small boat includes a steering handle for a hull disposed thereon. Each magnetic pole has a primary magnet and two auxiliary magnets disposed on respective sides of the primary magnet. A uniform transfer magnetic field is applied over the entirety of track surface of the slave medium so as to simultaneously perform a magnetic transfer over the entirety of the track surface. An array of heat fins is bonded to the inactive surface of the wafer by a thermally conductive curable resin.