Sometimes when I go to try a distro on a YUMI multiboot USB, it will not be listed, so I have to make it a directly-bootable ISO. However, most of the time, when booting, it will give an error saying it must be in one contiguous disk space. This never happens with listed ISOs. Is there something in the menu file on the USB to make it ignore or go past this? For example, I wanted to try GNOME Ubuntu 13.10, but it wasn't listed in YUMI, so I made it a directly bootable ISO. This is its menu entry: # Modify the following entry if it does not boot title Boot ubuntu-gnome-13.10-desktop-i386.iso find --set-root --ignore-floppies --ignore-cd /multiboot/ISOS/ubuntu-gnome-13.10-desktop-i386.iso map --heads=0 --sectors-per-track=0 /multiboot/ISOS/ubuntu-gnome-13.10-desktop-i386.iso (hd32) map --hook chainloader (hd32) Yet I got the contiguous disk space error. I know there is a program to defragment ISOs, but I don't want to wear my USB, and it doesn't seem like it should be necessary.