data growth

http://www.emc.com/leadership/digital-universe/expanding-digital-universe.htm is a wonderful page by EMC2 that estimates the amount of data in the world. 100 exabytes this year so far!!

I reckon that means we now have about a zettabyte (10^21 bytes) altogether. That's a bit less that I would have thought, since I calculated we had about that much in 1992, but maybe they're right. Or maybe they left some sources out. Either way, it's still a lot.