Actually, some BIOSes allow you to change the boot order to any drive on the primary or secondary channel. Like mine, for example (ECS K7S5A). I can pick IDE-0, IDE-1, IDE-2, IDE-3. It will attempt to boot to that drive. Also, many BIOSes have a "boot menu" thats accessed by hitting a key during the POST (mine's F8). You can pick whatever you want to boot from there.