I bought a new computer and I would like to take the hard drive out of my old computer and put it in the new one. The new hard drive is 80 GB, and the one I'm taking out is 160 GB. I got a new cpu because the old one was 6 0r 7 years old and the processor was slow. My question is: What do I have to do? Do I have to "clean" my old hard drive? can I run that one as a slave? And do I have to erase the windows I have on the old HD, because I have windows XP on both of them? I just want to keep the HD that I upgraded to just 6 months ago, it was a pretty good investment. Thank you for any response I get.