Unmounting USB flash disks

Hi everyone, I'm running Suse Linux 10.0 and my desktop is KDE. I have an issue with USB disks. When I plug one in, it gets recognised and mounted, and KDE asks if I want to open it in konqueror. So far so good. However, after I've finished working with it, I can't unmount it. If I right-click on it in, and select "safely remove", I get an error which says that there's no entry for this device in fstab, and I'm not root. So I have to open a shell window, become root, and unmount it. Gnome, running on Fedora Core 4 can unmount such hotplugged disks, so it must be possible. Any idea how it can be done in Suse/KDE? Do I need any extra software or configuration? Or is this a bug that I should file? Anand