Where and when (cmdlines.txt, RunOnceEx, etc.?) can you use diskpart during an unattended install? In the WINNT.SIF file, I'm guessing that I need to add the following line in the [GuiUnattended] section: ProfilesDir="P:\Profiles" But, when does this ProfilesDir become a part of the system? And can I run diskpart to assign the drive letter before Windows creates ProfilesDir?