The answer differs depending on your distro, generally you will find your external media under /mnt for example /mnt/cdrom /mnt/dvd etc. You may need to "mount" the disk before you can read its contents but I think Mandriva does this automatically anyway.
The question is, what is a mahnamahna?
The question is, who cares?
Sometimes the icons don't appear on the desktop to do so, right-click your desktop go to configure desktop -> in the left hand side choose behaviour -> On the top tabs choose device icons. and then go down and click on umounted cd, mounted cd, unmounted rewriter and mounted rewriter, that was if it doesn't auto-mount you can right click on the icon and choose mount.