'zettabyte' definitions:

Definition of 'zettabyte'

(from WordNet)
noun
A unit of information equal to 1000 exabytes or 10^21 bytes [syn: zettabyte, ZB]
noun
A unit of information equal to 1024 exbibytes or 2^70 bytes [syn: zettabyte, zebibyte, ZB, ZiB]