I am using Red Hat Enterprise WS to host a data base and had it set up to back up the data to a USB Flash Drive. I was using up2date to keep the system up to date and somehow lost all USB support. I Know that it's not a hardware problem because I have an identical PC and when I switch the hard drives the problem stays with the hard drive. In the KDE Control > Center Information > USB there's nothing listed. It's like I lost the USB part of the kernel.