How big is a zettabyte?

I’ll be honest: this is the first time I’ve ever used the word zettabyte. I’ve heard of petabytes and even exabytes, but zettabytes are a whole new level of bytes. If a zettabyte is beyond your comprehension, too, it’s essentially one billion trillion bytes: a 1 with 21 zeros at the end. To put that into perspective, one exabyte — which equals 1/1000 of a zettabyte or 1 million gigabytes — is roughly equivalent to the capacity of 5.1 million computer hard drives, or all the hard drives in Minnesota.

From Nick Bilton’s The American Diet: 34 Gigabytes a Day