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The zettabit is a multiple of the unit bit for digital information or computer storage. The prefix zetta (symbol Z) is defined in the International System of Units (SI) as a multiplier of 1021 (1 sextillion, short scale),[1]and therefore 1 zettabit = 1021 bits = 1 000 000 000 000 000 000 000 bits = 1000 exabits. The zettabit has the unit symbol Zbit or Zb.
The zebibit is a multiple of the bit, a unit of digital information storage, prefixed by the standards-based multiplier zebi (symbol Zi), a binary prefix meaning 270. The unit symbol of the zebibit is Zibit. 1 zebibit = 270 bits = 1 180 591 620 717 411 303 424 bits = 1024 exbibits.