Prefixes for bit and byte
Decimal Value SI 10001 k kilo- 10002 M mega- 10003 G giga- 10004 T tera- 10005 P peta- 10006 E exa- 10007 Z zetta- 10008 Y yotta-	Binary Value IEC JEDEC 10241 Ki kibi- K kilo- 10242 Mi mebi- M mega- 10243 Gi gibi- G giga- 10244 Ti tebi- 10245 Pi pebi- 10246 Ei exbi- 10247 Zi zebi- 10248 Yi yobi-

A petabyte (derived from the SI prefix peta- ) is a unit of information or computer storage equal to one quadrillion bytes, or 1000 terabytes. It is commonly abbreviated PB. When used with byte multiples, the prefix may indicate a power of either 1000 or 1024, so the exact number may be either:

• 1,000,000,000,000,000 bytes — 1000⁵, or 10¹⁵, or
• 1,125,899,906,842,624 bytes — 1024⁵, or 2⁵⁰.

The term "pebibyte", using a binary prefix, has been proposed as an unambiguous reference to the latter value.

See also

• petabit
• orders of magnitude (data)

References

External links

• CacheLogic Survey: P2P Accounts for 10 Petabytes of Data
• Fancy a Million-Gigabyte Hard Drive?
• Remember when 1MB was a lot?