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
|Multiples of bytes|
|Orders of magnitude of data|
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. 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 (around 400 thousand cubic metres).
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.
Kilobyte, all the way to yottabyte, are units of the International System of Quantities. So far, yottabyte, adopted in 1991, is the largest. Further terms beyond yottabyte have been suggested by some but not adopted. Until larger scales are officially adopted, yottabyte remains the largest.
- Diaz, Jesus (7 Jun 2010). "The One Hundred Trillion Dollars Hard Drive". Gizmodo. Retrieved 7 March 2013.
- "Archived copy". Archived from the original on 2017-02-02. Retrieved 2017-01-20.CS1 maint: archived copy as title (link)
- Villanueva, John Carl (2009-07-30). "How Many Atoms Are There in the Universe?". Universe Today. Retrieved 2019-03-12.