New System Disk for XP Pro

I currently have a SATA 120GB hard drive in my computer with XP Pro on it. I have a new 120GB SATA disk I want to add as the primary and re-install XP Pro and use the old disk as data storage.
Do I need to do anything to the old installation if I change it to the other SATA connection, or can I just connect new disk to the Number one cable and the old to the number 2 cable and install XP Pro?