FDISK 3.10 has a small bug causing useful MSX-DOS2 commands like UNDEL not to work. The problem is the Volume ID isn't set according to MSX-DOS2 specifications. I've made a little tool called FIXBOOT that will fix this problem and allow. The patch is performed in such a way that it will remain more or less compatible with the PC one. The tool is available in the download section of my Home Page.