Unable to Create a System Image on DVD

I have Win 7 64 bit installed on my laptop as well as my desktop. System images for both are on external HD's.

On the laptop, I have created a system image on blank DVD's using DVD-R's. No problems -- I can restore from the DVD's.

However, when I try to create a system image on blank DVD-R's on my desktop, I get a message saying something like, "format was unsuccessful." If I use a DVD+RW the process runs to completion and I can restore from it. I had to use RW's because I don't have and +R's.

I get the same unsuccessful message if I try to format a blank DVD-R with Win 7.

My DVD burner on the desktop says it is a +R. Does that mean I can't use -R's.

I've no idea whether this is a Win 7 problem, burner problem or a problem on my part.

Would someone please try to straighten out the dense old mind?

Thank you very much.

Thank you, Jacee.

I had a dim idea about the subject but it was very nice to see it all in one place so simply stated.