| NJ5 said: I have no idea, but I wouldn't be surprised if the "wasted" 1.7 GB includes the filesystem as well as other stuff which also exists on other game disc formats. I would certainly hope they didn't use 1.7 GB just for DRM.
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Although I am not sure if this is the case for the 360 in particular, I was under the impression that game copy protection on the consoles in the past were implemented by randomly distributing errors throughout the disk whose positions the console's disk reader would hash and compare against a checksum stored at a known location. Obviously, the random distribution of the errors means that performance would neither be helped nor hindered.
However, I doubt the 1.7 GB is for DRM or FS overhead. If I had to guess, I would say it's likely mostly used to allow for better production yeilds either through larger Reed-Solomon codes or some other means.
