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> That is to say "no layers" or "right on the substrate".

Ok, I feel very pedantic saying this, but the substrate is the thing that is mostly semi conductors :P.

This "silicon is not a metal" pedantry is a whole new layer of tedium. But if you want to take it that way: the data is mostly carried in the metal layers of aluminium, and the substrate is .. a substrate that's not doing very much.

If you really want to be pedantic then the data is processed and stored in flip flops and stored as charge in semi conductor dielectrics.

But don't take this so seriously, I work in semiconductor manufacturing and even I don't take it that seriously.

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