I get a 404 on the url in the OP's post, but if someone has a url to the driver disk in question, I can try and look at what the issue might be
Hi
http://kbase.redhat.com/faq/FAQ_103_13121.shtm
Or go to http://www.scms.waikato.ac.nz/~clintd/R905/ just to get the files I obtained from Dell.
On closer reading of the instructions I see that the say to use a USB CD/ DVD drive anyway so I am confused as to what the point of the driver disk really is.