ImgBurn nicely informed me of my error:
That is one of the best dialogs I have ever seen. Ever. It's not just evidence of smart logic, but also properly presenting it to me, and in an entertaining way to boot.. All developers dealing with UIs should learn from this great example.
That wasn't it though, being out of practice I also forgot to create a volume label! Not to worry, ImgBurn also let me know about that:
This great usability and functionality exists in a FREE program! I love it. This type of excellence should be rewarded - and can be (there's an option to donate on the website).
That's about it, really, I am seriously impressed by ImgBurn - it's a great tool and deserves attention.