if a disk is named in /etc/fstab by UUID and given user access, it cannot be unmounted by the user (root works fine). for example: $ blkid /dev/sdb1 /dev/sdb1: UUID="4583-4324" SEC_TYPE="msdos" TYPE="vfat" $ grep 4583-4324 /etc/fstab UUID="4583-4324" /mnt/tmp auto noauto,quiet,rw,defaults,users 0 0 $ mount /mnt/tmp/ $ umount /mnt/tmp/ umount: /mnt/tmp mount disagrees with the fstab $ sudo umount /mnt/tmp/ $ Daniel V <padawan.hu@xxxxxxxxx> reported the issue here: http://bugs.gentoo.org/253811 and refers to an old Ubuntu bug against util-linux-2.12r (with a fix that doesnt apply cleanly at all to latest git): https://launchpad.net/ubuntu/+source/util-linux/+bug/71609 -mike
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