Some people like to mount partitions from other operating
systems (DOS, Windows, OS/2, etc.) so they can use them under
Linux. These partitions must be created and copied under their
own operating system, and you should unmount them before copying
your Linux partition. For example, if you have a DOS partition
mounted at /dos, you must unmount it with this command: Note
that the command is umount, without the first letter n in the
word unmount. You should also unmount network drives.