Yep. NOR and NAND flash are constructed differently, but programming/erasure and tunnel injection/release are changes in configuration rather than accumulation/

Yep. NOR and NAND flash are constructed differently, but programming/erasure and tunnel injection/release are changes in configuration rather than accumulation/release of charge. Core memory (ferrite bead), SRAM (4 transistors/bit) and DRAM (1 transistor with a pseudo capacitor/bit) would increase in relativistic weight depending on their state. The same is true of batteries, ultracaps, or anything that consumes or stores large amounts of energy. m = E/c^2. 1e17 J weighs about 1 kg. That's about the energy of 2 of the large nuclear weapons ever tested. Let's suppose we have an average largish lake, 100 km^3 or 1e14 kg of water, and we store it at average height of 60 m above a generator. PE=m*g*h. That 6e16 J of potential energy weighs 651g.