why are you using windows software raid, surely if your building the array in the intel raid config thing it should be using its "hardware" raid, so windows would only see the one drive?
I know its not really hardware raid btw.
Just doing some testing to compare against the controller.
This is weird. When I enabled Raid in the bios and built the array in the raid bios and rebboted I got BSOD even after installing the the RST drivers.
So I went back in and enabled ACHI and rebooted.
I then saw a 1TB disk in disk management and ran some tests

Now its seen as an INTEL Raid volume although I have ACHI enabled in the bios not RAID

