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Yottabyte (YB)

Last updated: March 16, 2015

What Does Yottabyte (YB) Mean?

A yottabyte (YB) is a unit of digital information storage used to denote the size of data. It is equivalent to a quadrillion gigabytes, 1,000 zettabytes or 1,000,000,000,000,000,000,000,000 bytes.


Techopedia Explains Yottabyte (YB)

The prefix "yotta" is part of the International System of Units (SI), and means 1024. Hard disk manufacturers label their products in SI, which may confuse some people in the IT field. The ISO, IEEE and the IEC all recommend using the unit yobibyte, which signifies 280 bytes.

Two interpretations can be made using the two standards:
  • Using SI, one yottabyte is equivalent to 1,000 zettabytes or 1024 bytes.
  • Using traditional binary measurement, one yottabyte is equivalent to 1,208,925,819,614,629,174,706,176 bytes, that’s 280 bytes, also equivalent to 1 yobibyte (YiB).

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