I have a G4/400 running OS 10.2.8 with 512 MB of RAM. I installed a Pioneer 106D DVR and am using Toast Titanium 5 to burn DVD's. I can only get it to burn at 2x. The drive is supposed to support 4x burning and so is the media I am using. When I try 4x, I get a buffer underrun almost immediately. Is there a way to get this set up to burn any faster? Thanks Kevin