I don't get involved too much with our SCCM system but I am building a large number of machines and making my own build stick. I'm struggling to work out where I'd put the files that are mapped to X in the above. Would there be a file share mapped during the build process? Could I drop the Disk-Part.Clean.txt file on a folder on the build stick, or at this point in the process can the system not see those folders?
Usually we just drop a diskpart.cmd and the txt file on the build stick and press F8 to navigate to it and run it that way, but this obviously looks like a better option.