A yottabyte is sup>24 bytes or 1,000,000,000,000,000,000,000,000 bytes. This is the largest unit of measurement for computer data.
(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.