Hi, I have used "FOR %%I IN (D E F G H I J K L M N O P Q R S T U V W X Y Z) DO IF EXIST %%I:\DVD.TXT SET DVD=%%I:" in the past works for all the time. Place this in run command and put a "DVD.TXT" in the root of my DVD. ::Run.cmd:: FOR %%I IN (D E F G H I J K L M N O P Q R S T U V W X Y Z) DO IF EXIST %%I:\DVD.TXT SET DVD=%%I: imagex /apply %dvd%\install.wim 1 c: Hope that works for you!!