I noticed an interesting detail. You can open the Red Steel iso from Paradox with GC-Tool. You won't be able to see the actual files but you can at least get some header informations like the name, serial, maker code and region of the game. The question here is: Would it be safe to assume(with the recent release of a backup tool for certain dvd drives) that a working backup is a backup that would display header informations in GC-Tool?