QUOTE(Intersect @ Sep 4 2009, 08:40 AM)
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If they implement their security right, they can detect any backup at any time regardless of "stealth" or not. Microsoft are not stupid, they can run any code to check anything they want at any time. Anyone who thinks otherwise hasn't looked at the code.
The problem with that theory is that while they might be able to detect discrepancies that could be a sign of a modded console or a backup disc, they cannot act on it unless they're 100% sure the box is really hacked. The negative publicity they'd get when they started banning legit boxes is much more harmful than the piracy itself.
Also, I think you're underestimating the people involved in hacking all these different drives, they actually *can* see the (disassembled) code in the drive firmware. It's very unlikely Microsoft is able to extract and verify the dvd firmware for all drive types, and all other known tricks to find out if someone tempered with it or the challenges used to detect a copied disc in the tray should be covered by the hacked firmware.
That said, a bad disc that is obviously not identical to the retail disc because there's stuff missing or incorrect, that's really easy to detect by simple inspection of the DVD layout, security sectors and checksums. It's much more likely Microsoft does extra checking on the ODST disc, especially if you go online with it, and maybe even planted the ISO as a bait, than that they suddenly introduced some fail-safe way of identifying a hacked console or copied disc.