My problem should be simple to resolve,maybe. I've a new HP a6040n desktop with Vista Home Premium O/S. SATA 320 HDD.(system still in box). I'm using a 320 GB Seagate IDE HDD (with XP Pro installed)for my classes. It is set in a 5 1/2 carriage so that I can take it home to do my studies. I also have an external USB 2.0 case which I can mount my HDD into.This HDD has to stay mobile . I have all cables and adapters to install either way. What is the "dualboot ini." command for Vista, and which is the best way to set this up. Both O/S are legal!