Thank you for pointing me in the right direction...I kept thinking it was a ffxi problem rather than a windows problem. If anyone finds this in a search later, what I tried was to mount the SD card as permanent storage. It didn't work. The new ffxi installer would still compute the required storage to install based on the C: drive even if I selected D: as the target drive. So I ended up creating ISOs of the original installation CDs and installed it with those. The original CDs allowed drive changes. So, I guess maybe your "google it" comment wasn't all that helpful after all. Thanks anyway!