Again, here are some diagrams with actual scores:

How does the tested drive read the data from a DVD-disk? Nero DVD Speed gives us the answer to this question. The disk with “Air Speed” movie was read at 2x constant speed, just like the CD-RW with a copy of the movie. Both CD+RW disks with copies of the movie were read at 2.47x. If you look at the read graphs of these two disks you will see that their transfer lines, unlike those of the original DVD and its DVD-RW copy, go beyond the nominal 4.19GB volume mark to stop on 4.38GB. The transfer speed on this last “dead” stretch is close to minimum - 0.1x and it’s not quite clear what this zone is for.