I have Nero's ultimate edition that includes CD-DVD Speed in the "Test drive" section. Can anyone tell me how to interpet the test results when i run the "disc quality test" on a dvd I have just made. What I mean is, what are PI errors and PI failures? What do the spikes mean on the graph and how can I tell if the dvd I just burned has errors on it. I tried Nero.com and cdspeed200.com and I can't seem to find a manual that has any info on this. Thanks Jack