A CD holds between 640 Meg and , I believe, 700 Meg.
A DVD holds about 4.3 Gig of data. There are multi layer DVDs and I think the 4.3 Gig, or so, applies to a single layer.
I've got a DVD burner in my new PC, but haven't tried it yet.
Another thing, there are + DVDs and - DVDs. Not all burners can do both types, although they are more common now.