That's Plextor Fan(atic) mind you!
The PX-712A is like a dog... Feed it a rubber toy, and it'll just suck on it, feed it a hamburger, and it'll do good, just not as good as it could do. Feed it a steak, and it does excellent!
Moral of the story? Feed it good media, Maxell, TY, MCC, 4x Ritek media written @ 4x all come to mind.