A terabyte (derived from the prefix "tera-" and commonly abbreviated TB) is a measurement term for data storage capacity. The value of a terabyte based upon a decimal radix (base 10) is defined as one trillion (short scale) bytes, or 1000 gigabytes.

The number of bytes in a terabyte is sometimes stated to be approximately 1.0995 × 1012. This difference arises from a conflict between the long standing tradition of using binary prefixes and base 2 in the computer world, and the more popular decimal (SI) standard adopted widely both within and outside of the computer industry. Standards organizations such as IEC, IEEE and ISO recommend to use the alternative term tebibyte (TiB) to signify the traditional measure of 10244 bytes, or 1024 gibibytes, leading to the following definitions:

* According to the SI standard usage, a terabyte (TB) contains 1,000,000,000,000 bytes = 10004 or 1012 bytes.

* According to binary arithmetic, a terabyte contains 1,099,511,627,776 bytes = 10244 or 240 bytes. Ambiguity can be avoided by using the term "tebibyte" when the binary meaning is intended.

The capacities of computer storage devices are typically advertised using their SI standard values, but the capacities reported by software operating systems usually uses the binary values.Fact|date=April 2008

A NTFS formatted terabyte hard drive shows 931 gigabytes of free, usable storage space under Windows XP.

Terabytes in use

* Wal-Mart's data warehouse in Middletown, Connecticut contains 500 terabytes (500 trillion bytes) of data as of 2004.cite web|url=http://www.eweek.com/article2/0,1759,1675960,00.asp|title=At Wal-Mart, World's Largest Retail Data Warehouse Gets Even Larger|date=2004-10-13]
*The U.S. Library of Congress Web Capture team has claimed that "as of May 2007, the Library has collected more than 70 terabytes (70 trillion bytes) of data"cite web | coauthors = About Web Capture | title=How large is the Library’s archive? |date=2007-05-26 | url = http://www.loc.gov/webcapture/faq.html]
* Ancestry.com claims approximately 600 terabytes (600 trillion bytes) of genealogical data with the inclusion of US Census data from 1790 to 1930.cite web|url=http://www.cbsnews.com/stories/2006/06/22/tech/main1740956.shtml|title=Ancestry.com Adds U.S. Census Records|date=2006-06-22]
* YouTube offices hold over 600 terabytes (600 trillion bytes) of user-submitted videos [cite news |title=YouTube serves up 100 million videos a day online |url=http://www.usatoday.com/tech/news/2006-07-16-youtube-views_x.htm |work=USA TODAY |publisher=Gannett Company, Inc |date=2006-07-16 |accessdate=2007-11-24 ] .
* Compete.com stores 100 terabytes (100 trillion bytes) of online user activity.Fact|date=September 2008
* Hitachi introduced the worlds first one terabyte hard drive in 2007 [cite news |title= Hitachi Introduces 1-Terabyte Hard Drive |url=http://www.pcworld.com/article/128400/hitachi_introduces_1terabyte_hard_drive.html |work=PC World |date=2007-01-07 |accessdate=2008-09-15 ] .

ee also

* Orders of magnitude (data)
* Terabyte (termite) is also the name of a fictional colonial termite that has become highly specialized in the documentary film "The Future is Wild"


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  • terabyte — ter‧a‧byte [ˈterəbaɪt] noun [countable] COMPUTING a unit of computer memory equal to 1,000 gigabyte S * * * terabyte UK US /ˈterəbaɪt/ noun [C] ► IT a unit used for measuring the amount of information that a computer can store, consisting of… …   Financial and business terms

  • terabyte — |tèrabáite| s. m. [Informática] Unidade de medida de informação, equivalente a 1024 gigabytes (símbolo: TB). • Plural: terabytes.   ‣ Etimologia: inglês terabyte …   Dicionário da Língua Portuguesa

  • terabyte — (n.) by 1982, from TERA (Cf. tera ) + BYTE (Cf. byte) …   Etymology dictionary

  • terabyte — (izg. tèrabajt) m DEFINICIJA inform. mjerna jedinica za kapacitet memorije, tisuću gigabajta, odn. bilijun bajtova (oznaka TB) …   Hrvatski jezični portal

  • Terabyte — Unidades básicas de información (en bytes) Prefijos del Sistema Internacional Prefijo binario Múltiplo (Símbolo) Estándar SI Binario Múltiplo (Símbolo) Valor kilobyte (kB) 103 210 …   Wikipedia Español

  • Terabyte — Un Terabyte es una unidad de medida informática cuyo símbolo es el TB, y es equivalente a 240 bytes. Debido a irregularidades en la definición y uso de el Kilobyte, el número exacto de bytes en un Terabyte en la práctica, podría ser cualquiera de …   Enciclopedia Universal

  • terabyte — UK [ˈterəˌbaɪt] / US noun [countable] Word forms terabyte : singular terabyte plural terabytes a million million bytes …   English dictionary

  • Terabyte — Einheit Norm IEC 60027 2 Einheitenname Byte, Oktett Einheitenzeichen B Beschriebene Größe(n) Daten In SI Einheiten …   Deutsch Wikipedia

  • Terabyte — Te|ra|byte [… ba̮it], das; [s], [s] (EDV): Einheit für sehr große Speicherkapazitäten; 240 Byte. * * * Terabyte,   TByte …   Universal-Lexikon

  • terabyte — te|ra|byte sb., n, s el. terabyte, ne (240 byte) (fork.: TB) …   Dansk ordbog

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