I'm attempting to create a USB flash drive boot disk for DOS in order to get my Mac Pro running DOS to flash my graphics card. However, nothing seems to be working. I'm currently using HP's flash disk utility to do the formatting/creation of the boot disk, and have tried FreeDOS (ODIN) and several other flavours of DOS to try and get this working (all this is done in Vista64) - the stick seems to work fine according to HP's utility, and when booted into OS X I can see command.com etc as I should. Essentially, I don't see why it isn't working. What isn't working is actual boot. OS X and Vista don't see the USB drive as an option in Startup Disk, and holding down at boot simply displays my OS X and Vista installs. Anybody with ideas? I'm totally stumped.