This is the first time I've had to set up a RAID... and I wanted the OS on a seperate disk, so I loaded XP onto on a 160 GB, and then rebooted and configured a RAID 0 with three 500 GB drives... and it worked fine, and even shows it in the device manager as working properly... but it does not have a drive letter assigned to it. I didnt' format the three 500 GB drives prior to configuring the RAID... did I need to format them first, or can I still format them, or am I supposed to go ahead and format them afterward?

In most cases you format afterward.
Post all the details if you need more info.

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