I want to install Windows 7 Enterprise on a machine using SCCM 2012 OSD. The machine already has Windows 7 professional installed on it. The machine has 2 drives C: and D: created on a single HDD. I want to retain the user data on Drive D as it is. The size of data on D drive is huge, and I don't want to waste time backing it up and restoring the same on the same machine. I want to retain 2 drive structure. I don't want backup data on a USB (using Easy transfer or similar tool), not do I want to use USMT to copy D drive data on to a server share location. Any suggestions on how to go about it?