When it accesses a real floppy disk, it seems to do Hung when the boot disk of MS-DOS (Win95/98/Me) was able to be started by using ISOLinux. example) Not inserted Floppydisk A>dir b: error message A/R/F ? A> inserted Floppydisk A>dir b: ....hung.... It seems to do Hung in Real PC though the phenomenon like place tested with VMware was not Hung. There was no problem in a usual floppy disk emurate that did not use ISOLinux at all. My hardware environment is as follows. CPU Pentium3 933MHz Dual Memory DDR SDRAM 256Mbytes X 4 MB Iwill DVD-266R HDD : IBM 30G CD-ROM : All SCSI CD-ROM (TekRam DC390F Pioneer DVD-ROM, TEAC CD-R, TEAC CD-ROM) Using ISOLinux and MEMDISK 2.08, 2.09-pre12 prompt 1 default 1 ontimeout 1 display DOS.TXT timeout 300 label 1 kernel memdisk append initrd=W95DOS.GZ label 2 kernel memdisk append initrd=W98DOS.GZ label 3 kernel memdisk append initrd=WMEDOS.GZ All Diskimage is 2.88M Floppy image.