How much memory does a Ghost take up?

[johndallman]

Originally Posted by The big one

On the internet, I've seen estimates of a full brain map being anywhere from a petabyte to a zettabyte*, so what estimates are given either by canon THS or your version of the setting?

Ghosts are all Complexity 7 (Changing Times, p. 53), which means as data they take up 10TB (Transhuman Space, p. 143). One advantage of a ghost over an SAI is that Ghosts are smaller than SAIs of IQ10 or more.