Phil Jones's free download "knowing Knoppix" really helped me out here. On page 48 he lists a command you can run as root from the root shell ( etc/init.d/autofs restart ) . basically, this unmounts all the file systems then remounts them , so close all your work before you do this. After that, the standard commands are mount and umount. I have trouble with the eject button not working, and the /etc command fixes that.

One weird situation I have is that th cd drive works fine for data files, and K3b burns cd's all day long, but most programs refuse to see .mp3 files or commercial music cd's If I left click on the dirve, it says "not mounted". Konqueror says there is nothing to see. The Cd audio program XMMS won't even open the CDrom location.
If, however, I go to VIdeo packages, and open XINE, I click on the CD button, and XINE sees the music CD's and the mp3's just fine . Go figure .