Zettabyte Era - Wikipedia
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One zettabyte is equal to one sextillion bytes or 10 21 (1,000,000,000,000,000,000,000) bytes, or, one zettabyte is equal to a trillion gigabytes. [4] [2] To put this into perspective, consider that "if each terabyte in a zettabyte were a kilometre, it would be equivalent to 1,300 round trips to the moon and back (768,800 kilometers)". [4]