|Now I am confused. If WinXP is installed to one ofthe SATA drives and you disconnect that drive how would you expect to boot into Windows?|
Just because a hard drive is connected and configured by the BIOS does not make it boot able. Generally speaking, you need an operating system installed on a hard drive before you can boot directly to that hard drive.
If you can see the IDE drives when you ARE in WinXP then you can install programs or store data on them now. You don't need an operating system installed on each hard drive.
If you have WinXP installed and running on one of your SATA hard drives then why do you want to change to one of the IDE drives? There is no advantage and possibly a disadvantage to that setup.
Post the model number of your Asus motherboard.