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
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.
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". DNA is much more advanced technology than microSDXC cards (for this application) and accompanied by uncertain costs, but this suggests potential information density.
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. 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.
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