Change TEMP folder used by MDT

If you have a server with MDT installed and you notice that during boot image creation the server runs really slow or you are just flat out of space on the drive you installed MDT you can change the MDT temp directory to another location.

During the boot image creation process all of items included in the wim are stored in the temp directory which could result in poor performance or a total crash of you system if you have low disk space.

Open regedit and go to the below key and add a new String value with the name of Temp_Dir with a value of the location you want the temp directory.

HKLM\SOFTWARE\Microsoft\Deployment 4\

Temp_Dir\"E:\MDTTEMP"