I don't know if a huge vmu would be supported by games, 2x and 4x vmu usually use a switch to swap between 2 or 4 virtual 200blocks vmus.
I think that a "4000 blocks vmu" would need to be cut in 20 times 200 blocks and would still be a pain to find your savegame.
But maybe I'm wrong about those bigger vmus.
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