Turns out that the setting "Raid Autodetect/AHCI" was causing the issue with the system. Once I changed it to "Combination: AHCI/ATA" it worked just fine.
Running Windows XP Media Center Setup on a DELL XPS 400. Setup fails to detect drives each time.   -Properly used Dell Support Drivers for the XPS400 -Made sure drives were detected in BIOS -Tried Drivers based on Motherboard Chipset (though I can't find the exact chipset for 82801GDH, so I had to find "similar" ones.) -Tried with Raid turned on and off between two hard disks. -Tried each disk independently     Any suggestions?
Dell XPS 400 Setup Won't Detect Hard Drive