If we can convert the mw2 disc to and .iso file, we can edit on the computer right? does this invalidate the checksum? We can reverse this and get a pc copy of the game, and convert the .iso to a .pkg, so that it will run on the ps3.
Go on wikipedia and search FAT32. The FAT32 file system can't handle files >4GB. So if you put the 7.5GB ISO onto your ext hdd with NTFS the PS3 won't recognize it because Sony made the PS3 not recognize NTFS drives >4GB. I have been saying this for about 2 - 3 weeks now... ISO method is dead.