. . . . "At step S5, the micro-computer 28 controls the FDC 31 to reproduce a track 00 on the outermost rim of the magneto-optical disc 9 by the floppy disc drive 32 to read data recorded in the route directory in this track or in the file allocation table (FAT) area to extract the information such as the filename or the address present in the data area of the magnetic disc 9." .