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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 (approximately 1.209 YB).


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] By late 2016 memory density had increased to the point where a yottabyte could be stored on SD cards occupying roughly twice the size of the Hindenburg[2] (around 400 thousand cubic metres).

With recently demonstrated technology using DNA computing for storage, one yottabyte of capacity would require a volume between 0.003 and 1 cubic metre, depending on number of redundant backup copies desired and the storage density: "Our genetic code packs billions of gigabytes into a single gram".[3] DNA is much more advanced technology than microSDXC cards (for this application) and accompanied by uncertain costs, but this suggests potential information density.[4]

The total amount of data that could be stored in the observable universe using each of the 1078 to 1082 atoms as single bits of information (using their spin for example) is between 1.25×1053 to 1.25×1057 yottabytes.[5] It would take up to 1.47×1064 years (over one million trillion trillion trillion trillion times the current age of the universe) for a single Samsung 970 pro SSD to write such an amount of data.[6]

See also[edit]


  1. ^ Diaz, Jesus (7 Jun 2010). "The One Hundred Trillion Dollars Hard Drive". Gizmodo. Retrieved 7 March 2013.
  2. ^ "Archived copy". Archived from the original on 2017-02-02. Retrieved 2017-01-20.CS1 maint: Archived copy as title (link)
  3. ^ "DNA: The Ultimate Hard Drive". August 16, 2012.
  4. ^ "Yottabyte DNA. Database of the New Age". August 17, 2012. Archived from the original on January 10, 2014.
  5. ^ Villanueva, John Carl (2009-07-30). "How Many Atoms Are There in the Universe?". Universe Today. Retrieved 2019-03-12.
  6. ^ "Samsung 970 PRO M.2 512GB NVMe SSD review". Guru3D.com. Retrieved 2019-03-12.