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I am not completely sure that I understood what you want. Lets see, you want to be able to boot from the RAID array where you install Xp, or from the other 160GB drive with XP home, right?? So you want to have the os boot choice at start up. If this is what you want to do, you can use a boot manager (or boot loader)
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Your comments are correct: I want to boot from the RAID1 drives, but I also want the option to boot from the 160GB drive. In past, I handled this by 1st installing XP on the 160GB drive; then disconnecting it from the IDE and thus WinXP doesn't "see" the 160GB drive. I then load XP onto the RAID1 array and later reconnect the 160GB drive. This seemingly worked OK & allowed me to have two independently bootable drives; but perhaps it isn't the right thing to do? I had several crashes and my NTFS system ended up being corrupt. THis leads me to question whether/not WinXP can exist on two drives independently without the aid of partition magic or something like that.

Thx.

Scott