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Because of irregularities in definition and usage of the kilobyte, the exact number in common practice could be any one of the following:

1. 1,000,000,000,000,000,000,000,000 bytes - or 10²⁴.
2. 1,208,925,819,614,629,174,706,176 bytes - 1024⁸, or 2⁸⁰. This is 1024 times a zebibyte. This is the definition most often used in computer science and computer programming. See integral data type.

To clarify the differences in usage between the "binary" and "decimal" uses of SI prefixes, the International Electrotechnical Commission (IEC), a standards body, in 1997 proposed that the "binary" quantities be known by new Binary prefixes which are related to but distinct from the International System of Units (SI) prefixes. As of 2004 this naming convention has not yet gained widespread use. The IEC names extend only up to "exbi-", corresponding to the SI prefix exa-. The IEC did not provide an equivalent for the SI prefix yotta- (Y; 10²⁴). Extending the apparent naming pattern used by the IEC suggests yobi- as a candidate name for 2⁸⁰ (Yi).

The prefix "yotta" comes from the Latin root octo-(via ItalianItalian is a Romance language spoken by about 70 million people, most of whom live in Italy. Standard Italian is based on Tuscan dialects and is somewhat intermediate between the languages of Southern Italy and the Gallo-Romance languages of the North. otto), meaning "eight", and is used here to represent one thousandFor information on the number 1000, see 1000 (number). Thousand is the name of a single released by techno artist Moby, which has the world record for the fastest tempo in beats-per-minute (BPM) of any released single. It clocks in at approximately 1,000 to the eighth power.

1 See also

• SI prefix
• Binary prefix

2 External links

• http://www.quinion.com/words/turnsofphrase/tp-kib1.htm
• http://www.nist.gov/public_affairs/techbeat/tb9903.htm
• http://www.wordspy.com/words/yottabyte.asp