I disagree. If your harddrive is slow, or it is somehow configured to run at slower speed than it should be, or it is somehow faulty, etc., you could get bad burn when you burn real data but get good burn when you do CD_TEST_B2. If that happens it can help isolating the problems. I've seen newbies who buy DVDRW for the first time and burn real data at 16x being unaware that their old harddrive/motherboard is not fast enough for 16x burning so they get bad burn and think that the burner/disc is to blame. If they do CD_TEST_B2 test and get good burn that would tell them that their burner/disc is good but the problem is with their harddrive/motherboard.
I think the main point here is that people should be aware of the difference in CD-DVD Speed between CD_TEST_B2 and burning ISO image from harddrive. Obviously some people think they are the same thing.
I agree. The disc should be fully filled. I think I read somewhere that CD-DVD Speed can fill the disc full when you burn ISO image smaller than the disc size. But I've just tried and that doesn't seem to be the case.
True. I don't think anyone here would do that. Testing system/harddrive performance by burning DVD that is.