I want to make an external hard drive that is a copy of my laptop hard drive that I can also boot from. I basically would like to be capable to pull out my on-board hard drive as well as boot from the external flash hard drive in a Vista Home Premium situation. I press F12 at startup as well as choose the external drive for boot purpose. I make use of Acronis True Image Home to clone the interior drive to the external drive but I can't get the laptop to boot from the external drive. What as well do I require to do to external drive to make this work?