On Fri, 20 Jun 2008, Haavard Skinnemoen wrote: >> ~ # losetup -o 4096 /dev/loop0 /media/usb >> losetup: /dev/loop0: Invalid argument > > Looks like UBIFS doesn't support loopback devices. Is that right? Right. Just added this FAQ entry: http://www.linux-mtd.infradead.org/faq/ubifs.html#L_loop_mount -- Artem