Terabyte
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Quantities of bytes
| |||||
|---|---|---|---|---|---|
| SI prefixes (decimal) | IEC prefixes (binary) | ||||
| Binary usage (often with KB for kB) | |||||
| Value | Name | Value | Name | ||
| 10001 = 103 | kilobyte | (kB) | 10241 = 210 = 1.024·103 | kibibyte | (KiB) |
| 10002 = 106 | megabyte | (MB) | 10242 = 220 ≈ 1.049·106 | mebibyte | (MiB) |
| 10003 = 109 | gigabyte | (GB) | 10243 = 230 ≈ 1.074·109 | gibibyte | (GiB) |
| 10004 = 1012 | terabyte | (TB) | 10244 = 240 ≈ 1.100·1012 | tebibyte | (TiB) |
| 10005 = 1015 | petabyte | (PB) | 10245 = 250 ≈ 1.126·1015 | pebibyte | (PiB) |
| 10006 = 1018 | exabyte | (EB) | 10246 = 260 ≈ 1.153·1018 | exbibyte | (EiB) |
| 10007 = 1021 | zettabyte | (ZB) | 10247 = 270 ≈ 1.181·1021 | zebibyte | (ZiB) |
| 10008 = 1024 | yottabyte | (YB) | 10248 = 280 ≈ 1.209·1024 | yobibyte | (YiB) |
A terabyte (derived from the prefix tera- and commonly abbreviated TB) is a measurement term for data storage capacity. The value of a terabyte is based upon a decimal radix (base 10) and 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 x 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 and intuitive decimal (SI) standard adopted widely in the 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 and current usage, a terabyte (TB) contains 1,000,000,000,000 bytes = 10004 or 1012 bytes.
- According to traditional and binary arithmetic, a terabyte contained 1,099,511,627,776 bytes = 10244 or 240 bytes. Ambiguity can be avoided by use of the standardized term for this quantity, the tebibyte.
The capacities of computer storage devices are traditionally advertised using their SI standard values.
[edit] Terabytes in use
| This article needs additional citations for verification. Please help improve this article by adding reliable references. Unsourced material may be challenged and removed. (December 2007) |
- The National Archives of Britain, which hold 900 years of written material, contains nearly 60 terabytes of data.[citation needed]
- Wal-Mart's data warehouse in Bentonville, Arkansas currently contains 500 terabytes of data.[1]
- The U.S. Library of Congress Web Capture team has claimed that "as of May 2007, the Library has collected more than 70 terabytes of data"[2]
- Ancestry.com claims approximately 600 terabytes of genealogical data with the inclusion of US Census data from 1790 to 1930.[3]
- CASTOR at CERN is almost reaching 10,000 TB of physics data.[4]
- One hour of uncompressed Ultra High Definition Video (UHDV) would consume approximately 12 terabytes of data.[citation needed]
- As of 2007, the largest 3.5 inch hard drive in the world, the Hitachi 7K1000, has 1 TB of data storage capacity using five approximately 200 GB platters and perpendicular recording.[citation needed]
[edit] See also
- tebibyte
- terabit
- gigabyte
- petabyte
- binary prefix
- orders of magnitude (data)
- Terabyte is also the name of a fictional colonial termite that has become highly specialized in the documentary film The Future is Wild
- Terabyte Interactive is also the name of a web design company based in Auckland, New Zealand. The company created the first CD-ROM pressed in New Zealand.[1]
[edit] References
- ^ At Wal-Mart, World's Largest Retail Data Warehouse Gets Even Larger (2004-10-13).
- ^ How large is the Library’s archive? (2007-05-26).
- ^ Ancestry.com Adds U.S. Census Records (2006-06-22).
- ^ Castor @ Cern website] (2007).
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