Well if your using the latest version ther is an option to add a hard drive the the "hard drive" tab. I havent tried it myself yet, but plan to put an IDE drive in my amiga and do a basic 3.9 install them move it over to UAE and add all the rest of the cool stuff like P96 to see how it works. I cant seem to get my 3.9 cd to install over the AIAB install I have now on the latest WinUAE.