On Thu, Feb 17, 2011 at 8:36 AM, dixan rodriges <dixan23 at gmail.com> wrote: > Dear All, > > > > I have created 252 loop devices in my system and i mounted few iso filses > into loop devices .when i rebooting the system error showing "faild to > umount " > > > how can forcefully umount the loop device Not specific to loopback devices, but in some cases I use fuser to kill all procs associated with a mount... You may also need to remount it as read-only before unmounting and maybe use the -nr option to umount.