Thanks for the quick replies, guys.

MPC doc...you are a legend!

That was the fix. Other than having a Homer Simpson "DOH" moment... it kills me that nowhere in any of the mobo or hardware documentation does this "little" step show up!

I started from scratch, reformatted both drives, doublechecked the BIOS settings, created the SATA/RAID driver floppy. Went back in, rebuilt the RAID, inserted the XP CD, waited for the SATA/RAID third party screen, installed the drivers, the XP install finally saw the combined drives, and it's up and running.

And...I gotta tell you...the install took only 18 minutes! I think I'm gonna like this hdwe. config! I've just started the long, long, long process of tweak, software, driver, application installs, but this thing is noticeably faster than even my current 64 machine.

Thanks again, Mobile PC Physician, and Silent One for the quick replies, and the correct answer. [BTW, Silent One, I had checked with WD, and they had nothing to offer!]

Ahhhh, good ol' WinDrivers forum...best techs on the planet.