The minimum estimate for the human brain's capacity I have encountered was about 3 terabytes, and the maximum as von Neumann's estimate, 2.8E20 bytes. My question is : how are they able to make this sort of comparison? I mean, I've heard on another thread that it compresses data in an extremely efficient manner, but then occasionally we still forget things and if we try to replay something in our heads, they are always very blurry (as reconstructed from other vague clues). And that makes the data quality sorta fuzzy. Also there are some things that 'come to us' when we don't exactly intend to recall it but 'escape us' when we try to recall something intentionally.