Newer kernels as shipped with Mandrake Linux bring an interesting feature for users frequently using floppy and CD disks. Installed (or not) depending on the chosen security level, it automatically mounts and unmounts media as they are inserted or removed. This is quite handy as there is no need to run mount or umount each time.
If you ever wish to change that behavior, going back to the good old manual mounting of media, simply issue, as root, the command
supermount -i disable |
supermount -i enable |