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Multiples of bytes
Value Metric
1000 kB kilobyte
10002 MB megabyte
10003 GB gigabyte
10004 TB terabyte
10005 PB petabyte
10006 EB exabyte
10007 ZB zettabyte
10008 YB yottabyte
1024 KiB kibibyte KB kilobyte
10242 MiB mebibyte MB megabyte
10243 GiB gibibyte GB gigabyte
10244 TiB tebibyte
10245 PiB pebibyte
10246 EiB exbibyte
10247 ZiB zebibyte
10248 YiB yobibyte

The yottabyte is a multiple of the unit byte for digital information. The prefix yotta indicates multiplication by the eighth power of 1000 or 1024 in the International System of Units (SI), and therefore one yottabyte is one septillion (one long scale quadrillion) bytes. The unit symbol for the yottabyte is YB.

1 YB = 10008bytes = 1024bytes = 1000000000000000000000000bytes = 1000zettabytes = 1trillionterabytes

A related unit, the yobibyte (YiB), using a binary prefix, is equal to 10248bytes.


  • In 2010, it was estimated that storing a yottabyte on terabyte-size disk drives would require one million city block size data-centers, as big as the states of Delaware and Rhode Island combined.[1] If 200 GB microSDXC cards (the most compact data storage medium available to the public as of early 2015) were used instead, the total volume would be approximately 800000 cubic meters, or the volume of 32 percent of the Great Pyramid of Giza.
  • With recently demonstrated technology using DNA computing for storage, one yottabyte of capacity would require a volume between 0.003 and 1 cubic meter, depending on number of redundant backup copies desired and the storage density: "Our genetic code packs billions of gigabytes into a single gram".[2] DNA is much less mature technology than microSDXC cards (for this application) and accompanied by uncertain costs, but this suggests potential information density.[3]

See also[edit]


  1. ^ Jesus Diaz (7 Jun 2010). "The One Hundred Trillion Dollars Hard Drive". Gizmodo. Retrieved 7 March 2013. 
  2. ^ "DNA: The Ultimate Hard Drive". August 16, 2012. 
  3. ^ "Yottabyte DNA. Database of the New Age". August 17, 2012.