yottabyte Last modified: Wednesday, November 07, 2001
2 to the 80th power bytes, which is approximately 10 to the 24th power (1,000,000,000,000,000,000,000,000) bytes. A yottabyte is equal to 1,024 zettabytes. The name yotta was chosen because it's the second-to-last last letter of the Latin alphabet and also sounds like the Greek letter iota.
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