i never use DVDA , i burn image files using prassi duplicator edition ..
the recordnow max also supports multiple drivers (up to version 4.5) , the new recordnowmax is crap , sonic totally ruined the best burning app there ever was ..
Prassi and Record now max requires that All of the drives you are burning to be the same make and model with the same firmware. You can disable this in the preferences, but it can, and in my experience does cause problems. You're better off spending and extra hundred bucks or two and buiding a standalone duplicator to put the new drives in. Then you don't have to tie up your computer to make copies.