256GB seems fine for me. I tend to have everything in the cloud in case I lose or damage my phone so actual use of the “hard drive” is fairly limited. I don’t really like playing such games on a phone and that’s the only scenario I can think of where I’d need so much space.

A cubic meter of notebooks? Holy shit. That’s about… 2145 A5 moleskines. Surely you are overestimating.

The math: 1/(0.21*0.148*0.015)

This looks nice, thanks!