The insides of my D3 discs were exactly like that when I replaced them a few years ago, in fact almost 50% of the braking surface was corroded away.
I replaced them for cosmetic reasons but immediately realised how much braking performance I'd been lacking
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Audi D3 S8 - 2007 - V10. B&O, Phantom Black, black and silver interior, and still completely standard with everything working as it should  SOLD 2023 
Audi TT - 2015 - Ultra
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