[pjc50]

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.

[newswasboring]

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.