Understanding USMT with MDT 2010 « Xtreme Deployment
The User State Migration Tool (USMT) is an extremely powerful and essential piece of an Operating System Deployment. With the release of the Windows AIK for Windows 7, USMT 4.0 was made available and includes many great new features such as hard-link migration (for more information on what’s new in USMT 4.0 see this article). MDT 2010 integrates USMT directly into the task sequence for both Lite Touch Installations and Zero Touch Installations. There have been several questions since MDT 2010 was released on how USMT works with MDT and how all of the pieces fit together.
Understanding USMT with MDT 2010 « Xtreme Deployment