I am working out on an answer as given here https://superuser.com/a/623998/63915 I copied the windowsios to a usb drive

mount -t o loop win.iso /media/usb

but I see permissions problem all the files are owned by root:root and when I try to do do

sudo chown -R user:user /media/usb/

there is no change in permissions in files of USB I see following

 ls -l
total 3250
-rwxrwxrwx 1 root root     110 Oct  9 17:11 autorun.inf
drwxrwxrwx 1 root root       0 Oct  9 17:11 docs
drwxrwxrwx 1 root root   40960 Oct  9 17:35 grub
-rwxrwxrwx 1 root root     313 Oct  9 17:25 grub.cfg
drwxrwxrwx 1 root root 1208320 Oct  9 17:13 i386
-rwxrwxrwx 1 root root   45124 Oct  9 17:14 ntdetect.com
-rwxrwxrwx 1 root root    3204 Oct  9 17:13 readme.htm
-rwxrwxrwx 1 root root  260288 Oct  9 17:14 RUFUSLDR
-rwxrwxrwx 1 root root 1310720 Oct  9 17:13 setup.exe
drwxrwxrwx 1 root root       0 Oct  9 17:13 support
-rwxrwxrwx 1 root root  449797 Oct  9 17:16 txtsetup.sif
drwxrwxrwx 1 root root       0 Oct  9 17:13 valueadd
-rwxrwxrwx 1 root root      10 Oct  9 17:13 win51
-rwxrwxrwx 1 root root      10 Oct  9 17:13 win51ip

what went wrong here?

  • What is the output of df -T command? Oct 9, 2013 at 12:45
  • I see my usb here /dev/sdb1 fuseblk 3914748 562760 3351988 15% /media/3AE27070E27031ED Oct 9, 2013 at 12:50

1 Answer 1


chown fails because the mounted file system is fuseblk. So you are trying to write meta data to a file system which the file system does not support (cannot store). You can only change permissions and ownership on a Unix filesystem like ext3 or ext4.

If you want that mounted point with ownership applied to a specific user/group, specify at the mount time:

mount -o uid=username,gid=groupname /dev/sdb1 /path/to/mount

See also:

  • well I am not mounting that usb,when I insert USB to my laptop ubuntu automatically does that, i think this default behaviour is caused due to gnome-mount (udisks) working in backend is causing problems,because when I unmount the USB from nautilus window sudo fdisk -l does not show any kind of USB stick i.e. /dev/sdb1 should come here Oct 9, 2013 at 13:44
  • @RegisteredUser Whatever you mount, I suspect that what you mount doesn't have a Unix filesystem format like ext3 or ext4. So, use mount with -o uid=username,gid=groupname option if you want that mounted point with ownership applied to a specific user/group. Oct 9, 2013 at 13:49

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