Nope RenG, that’s not what PoweRec does. The technique measures the write quality during the recording process. When it ‘thinks’ the write quality is decreasing it will lower the speed. Besides that, PoweRec will also check which speed is suitable for the inserted media before starting the recording process. So,
so if you leave Powerec enabled and you are burn dvd at 4x, the real speed is always gonna be 2.4x
is not true. When PoweRec is enabled you can also burn at 4x, provided that the inserted media is supported and can thus actually be written at 4x. When the media is not supported PoweRec will use a safe recording speed of 2.4x and when you think your media will work at 4x you can disable PoweRec to force a higher recording speed. Problem is, is that your media may be written at a speed that’s too high and thus you risk a coaster.
BURN-Proof has nothing to do with this. It’s a technique that pauses the recording process when your computer fails to deliver the drive with enough data.