New mobo, cpu, power supply, and a new clean install Vista HD. Old drive shows up in BIOS and when clicking on the My Computer icon for the old drive my only option is to format. After reassembling old computer and old drive it boots without compaint with all data intact. I was hoping to upgrade with new drive and have old drive show up as slave and from there copy over files, format old drive, and make it my backup drive. Shouldn't the old drive just show up as a slave in the upgraded pc? Why does it insist on formatting first? Thanks.