Great, that works, and I have desktop shortcuts too, although I can't unmount the drive from the desktop? Seems odd, but I suppose that's because I'm not root. Is there an easy way to be root temporarily from the KDE GUI?
Also, how to I delete spurious mountpoints? rm tells me they are not files, so I can't delete them. I'm guessing there is a corresponding directory delete command.
Thanks again for all your help, Linux's quirkiness is made up for by it's supportive community!