I just purchased a license for Windows 8 Pro x64 Eng Intl (OEM - System Builder).
I want to make a backup copy of the disc - create an ISO image from it in order to write-it then to an USB 3 stick and get a faster install experience, and also for ensuring that if my original disc gets scratched I'll still be able to reinstall my Win8.
I made a copy with Nero already, but the Windows 7 USB/DVD Download Tool says the ISO file is not valid and won't allow me to write-it on an USB stick.
Windows 8 (90-day Ent Eval) which I have now opens the file just fine in Explorer.
What is the issue and how can I make a backup ISO of my Win8 Install DVD?