I use ImgBurn to burn my weekly server iso backups to DVD+RW discs. The DVD+RW discs get rotated and reused.
I have noticed, since version 1.2.0.0 and newer, now when burning the image to a DVD+RW (that already contains data), it says "This disc needs to be formatted before you can write to it".
If I format the disc it takes a long time.
Previous versions (e.g. 1.1.0.0) would simply warn that the disc contains data, and if you continue will be overwritten. You did not have to reformat the disc each time, which was a lot quicker. This is also how Nero works, which I have gone back to using for burning the images.
It seems a bug has been introduced or some functionality lost in the newer versions.