Study estimates human information capacity at 256 exabytes

How much information could you store on every technological device in the world? Every hard drive, book, video tape and microchip on a credit card? A research team from the University of Southern California has estimated that figure, in 2007, to have been 256 exabytes of data.

That's a 256 billion gigabytes, the equivalent of 1.2 billion average PC hard drives, enough CDs to make a stack which would reach beyond the moon and 15 libraries for every person on the planet.