I've had this problem with CDs before. Don't know why but I couldn't unmount them as a user and had to do as root, SU didn't even work. Have you added these as entries to your /etc/fstab? If so, remove them and reboot as said above. How are you trying to umount it? If you know the device such as /dev/hda2 etc...You should be able to umount /dev/hda2 or umount /, Next time make a mount dir that isn't root, could make boo-boos obviously.
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