Jim
I found the manual for the SATA RAID subsystem that comes with the A7N8X-E-Dx motherboard, it doesn't come in the CD, but you can download it from ASUS' website.
Whole package from ASUSIt has some pictures of how it looks like once installed, and from that I can say that it's exactly the same as the RAID system I have with two SCSI drives on W2K, and yes, I have the RAID array as Drive C:
Alex