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The yottabyte (derived from the SI prefix yotta-) is a unit of information or computer storage equal to one septillion (one long scale quadrillion or 10) bytes (one quadrillion gigabytes). The unit symbol for the yottabyte is YB.

As of 2010, no storage system has achieved one zettabyte of information. The combined space of all computer hard drives in the world does not amount to even one yottabyte, but was estimated at approximately 160 exabytes in 2006. As of 2009, the entire Internet was estimated to contain close to 500 exabytes.

When used with byte multiples, the SI prefix indicates a power of 1000:

1000000000000000000000000bytes = 1000 or 10 bytes

The term "yobibyte" (YiB), using a binary prefix, is used for the corresponding power of 1024.

See also

• Binary prefix

References

1. Expanding Digital Universe IDC White Paper (pdf)
2. Internet data heads for 500bn gigabytes

• Units of information