Not strictly Fedora-specific I suppose, but I need to boot a live CD on machine without a working optical drive. I already considered unetbootin - however, my external hard drive doesn't show up there (it's not under HDD nor USB). I know I could just use a USB key, but I'd rather learn to make external hard drives run live distros (this isn't the first time I have a need to do something similar). None of the guides I've found so far are very specific as to what to do, and my several attempts so far have been unsuccessful.
Where would I begin?