Hello. I've done some searching but cannot find an answer to my exact problem. I have XP on my C: drive, and I installed XP on a new bigger hard drive (as drive H. Both are SATA drives. I know that I get the option of which OS to launch when I start up my pc, but if I unplug power from the C: drive (or disable it in the Setup), I can't boot from the new drive H:. How do I make this the boot drive? My goal is to reformat the old C drive and use it as backup storage. Does the drive letter matter? At this point, I have installed several programs on the new drive (H and it seems like I should leave it H. Can I boot from it? Ideally, I would like to be able to boot from either. Thank you so much for any help.