try formatting your drive first and then do the setup all over again. I dont know if u can see a usb drive from dos, only way to know is to try. I tried and i couldnt but maybe cause my drive was over 1 gig in size. I didnt know u couldnt boot to a over 1 gig drive till after i had tried for a week, i ended up using the NTFS for dos boot cd and harddrive method. But to do that u need an extra hdd laying around that u can format and use for the fw instead of a usb drive. If u are using the new version of iprep make sure u find a new guide for intructions cause textbook is outdated and says to use idump but new version uses dsam instead. but u can just run the autoexec.bat file and it will guide u thru the process.