I have a UDI deployment task sequence setup with MDT 2012 UPdate 1 and SCCM 2012 SP1, and when I try to deploy Windows 7 to a machine with an OS already on it, WinPE assigns the System Reserved partition the C: drive, and the OS the D: drive. This is fine when I choose to format and partition the disk in UDI, but when I choose to migrate user data (using local hard links), the OS is applied to D: and the OS is then on the D: drive, which we don't want.
How can I get WinPE to ignore the System Reserved and stop assigning it a drive letter? And make the OS partition the C: drive?