Due to recent events, I'd like to take the time to point something out: without major, major security fuckups, Flashcards on the switch, no matter how heavily promised, are not possible. The switch's gamecart security is airtight. Anyone claiming otherwise is a scammer or a fool.
It was several things: 1) sector format subtly changed, 2) scrambing seeds different, 3) some nonstandard media type in the lead-in, 4) a laser physically punches "scratches" into lead-in, 5) laser-cut BCA encodes PSNs of thusly damaged sectors, symmetrically encrypted.
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The theory is that angular positions of sectors aren't predictable, so you can't duplicate and then "re-make" the same scratches because they'd hit different sectors. Then Datel figured out you can just... turn off the mastering laser to simulate a scratch. Oops.
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This is how they made their unofficial GC/Wii discs, by copying the BCA area from a real game and then duplicating the broken sectors by shutting down the laser (breaking the low level bitstream) even though they're no longer in the same physical location.
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