That's what I was afraid of. But then, some people recommend not installing Windows to C: for added security against hackers, viruses, and the like. If it's not possible to freely pick which drive letter to install to, how do they install Windows to a letter other than C:? Maybe I have to make C the 811GB partition and D the 120GB partition, and then install Windows to D? But if I remember correctly, when I ran my unattended install, it said C was unformatted and asked if I wanted to format C. When I said "yes", it formatted, and then installed Windows. I didn't have a chance to pick D. I think I'll try "AutoPartition=0" in my winnt.sif file.