-umount ${dev}1
-mkfs.vfat -F 16 -n kubuntu8 ${dev}1
-umount ${dev}2
-mkfs.ext2 -j -b 4096 -L casper-rw ${dev}2
-umount ${dev}3
-mkfs.ext2 -j -b 4096 -L home-rw ${dev}3
+umount ${USB_DEV}1
+mkfs.vfat -F 16 -n kubuntu8 ${USB_DEV}1
+umount ${USB_DEV}2
+mkfs.ext2 -j -b 4096 -L casper-rw ${USB_DEV}2
+umount ${USB_DEV}3
+mkfs.ext2 -j -b 4096 -L home-rw ${USB_DEV}3
+syslinux -sf ${USB_DEV}1
+install-mbr -p1 ${USB_DEV}