Alcohol complains about unformatted disc

I am trying to burn an .iso of a DVD to a new DVD+RW. When I click Start it brings up a window that says I have to insert a blank disc. It lists the one I already have in there as “Unformatted DVD+RW”. What do I have to do to format it?

Ok I tried using Erase first, but it wouldn’t do that either, still asked me to insert a blank disc.

So I brought up Nero instead and used the Erase function. Nero was able to erase the disc. Great, I thought.

Now I go back to Alcohol, try to burn the image and it says…

“Not an empty disc”

Really! I just erased it and it is complaining that it’s not empty? Does Alcohol even support DVD+RW?