Good point. My estimate was a naive upper bound, ignoring things like efficient storage and assuming all data is included, and was focusing on how much storage

Good point. My estimate was a naive upper bound, ignoring things like efficient storage and assuming all data is included, and was focusing on how much storage is available on portable devices (that sometimes stretch the bounds of portable). Then the question is what does one do with all the extra space in this portable world device? Wikipedia information? Languages? Fun times.