For to long, by necessity, I have been backing up from one internal harddrive to another internal harddrive and it works fine. What I want to do is backup to an external harddrive that I can switch out and take off site. For some reason, my system is not recognizing any external harddrive. I have tried 3 differant brands which are recognized just fine on other computers. Does anyone have any idea as to what could be the problem with my system?