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Zettabyte

Zettabyte
Unit of storage. Often abbreviated to ZB. 1 zettabyte (ZB) = 2 to the seventieth power (270) bytes = 1,180,591,620,717,411,303,424 bytes = 1024 exabytes = 250 megabytes.

1024 zettabytes = 1 yottabyte.