A zettabyte (derived from the SI prefix zetta-) is a unit of information or computer storage equal to one sextillion (one long scale trilliard) bytes. It is commonly abbreviated ZB.

1 zettabyte = 10²¹ bytes = 1 000 000 000 000 000 000 000 bytes

exabyte << zettabyte << yottabyte

See also

• Binary prefix