Date: 2012dec23 OS: Linux Q. What should I do when df is hung (frozen) ? A. I have seen this happen because of trouble with remote filesystems. (eg NFS or Samba mounts) so use the -l command to only see the local files:

df -l

If this doesn't hang you know its a remote filesystem issue. Maybe the other machine is down, etc. You can use the -f (force) option for umount on your remote filesystems eg:

umount -f /mnt/mywindowsbox/drive_c