Need to rebuild my drop-dead Windows 2012 R2 server.
There is no way to burn the 5.4GB ISO to my single layer 4.7GB DVD media.
So the only way is to USB boot it, here is how.
Format your USB drive - FAT32 ONLY. Make sure it is format with Master Boot Record scheme.
Plug in to your machine
Download your Windows 2012 R2 ISO file
Download Windows 7 USB/DVD Download Tool here
Install Windows 7 USB/DVD Download Tool
Run it and select your ISO and target your USB
Done