Movies on a DVD are stored at different depths depending on the technology. Blu-Ray discs store information only 0.1 millimeter from the surface while HD-DVD discs store it at 0.6 millimeters.
So where does NME store it, 0.35 mm?
I can see why someone would choose a format with only 0.1mm of protection - more scratches means more sales
Actually - it's more complicated than that:http://www.cdfreaks.com/article/186/2
And from http://www.cdfreaks.com/article/186/4
Here we can find an advantage for Blu-ray, resulting from the new structure of the disc. Since the recording layer for Blu-ray data is only 0.1 mm away from the surface of the disc there is enough space below to integrate a complete 8.5 GB DVD DL disc. JVC has already managed to develop such a single-sided disc by using a for red laser transparent Blu-ray layer.
DVD9/HD-DVD is also possible, but not on a single-sided disc. Cinram, one of the HD-DVD backing companies has developed a hybrid disk with two sides. The first consists of a dual-layer DVD that can store up to 8.4GB of data, while the other side is a HD-DVD capable of storing up to 15GB. Memory-Tech and Toshiba has also developed single-sided hybrid discs that contain a 15GB HD-DVD layer and a 4.7GB DVD layer.