Ok, I'm at work, so most of the sites I would use as reference are blocked, but it breaks down something like this:
XDG3 uses topology data spanning the entire data surface of the disc, including the outer edge that is normally inaccessible to burners. Truncating unceremoniously lops off any data outside of that writeable range and just ends the disc there.
Now, I can't remember if this next bit was just rumor/panic, but I remember a credible source stating that if a disc fails enough of those checks, it will disable the console's ability to play games. Period. Offline or not.
Now, yes, this would imply that the only consoles susceptible to this are consoles with drives that support XGD3, and so Sammy and sub-78 Hitachis are safe. To me, it still seems like a terrible idea; especially since it wouldn't be hard (I imagine) for publishers to start putting actual game data in that area of the disc, instead of just AP stuff. Keep in mind that we are now fully in the realm of conjecture, and I have no evidence that this can or will happen.
That being said, the hardware, software, media, and techniques are all readily available to make full backups of XDG3 discs, so, in my idealistic little universe, anything less is simply being overly lazy, cheap, and asking for problems in the future. The burners are not $100/ea, and the media is less than $3/disc. It is worth it, in my mind, to protect a $250 console and each $60 game disc as perfectly as possible. Anything less, to sum up, is stupid. But it is ultimately your stuff, or whoever's stuff you are working with, so it is your choice (their choice) what to do with it. And that's really what the scene is all about. People choosing what they want to do with their stuff.
Hope that clarifies my position. Take it easy!
This post has been edited by CarpeDiem0: Apr 3 2012, 04:09 AM