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The terabyte is a multiple of the unit byte for digital information. The prefix ''tera'' represents the fourth power of 1000, and means 1012 in the International System of Units (SI), and therefore one terabyte is one trillion (short scale) bytes. The unit symbol for the terabyte is TB. 1 TB = = = . A related unit, the tebibyte (TiB), using a binary prefix, is equal to 10244 bytes. One terabyte is about 0.9095 TiB. Despite the introduction of these standardized binary prefixes, the terabyte is still also commonly used in some computer operating systems, primarily Microsoft Windows, to denote (10244 or 240) bytes for disk drive capacity.〔(How operating systems report drive capacity ), Seagate Inc.〕〔(Windows disk space using TB as a binary value, from Seagate.com )〕 ==History== Early if not first usage of terabyte in selected production products: *Supercomputer memory: 2005 (binary usage)〔(Gara, et. al., (2005, March/May). Overview of the Blue Gene/L system architecture. IBM JRD, p.195-212 ) "32 TB of total memory" (p.203)〕 *Hard disk drives: 2007 (decimal usage)〔(Hitachi Introduces 1-Terabyte Hard Drive )〕 *Tape drives: 2010 (decimal usage)〔(expected in H1 2010 with 1.5TB - 3TB storage (updated) )〕 *Motherboard Memory: 2011 (binary usage) 〔(New Intel Server Board to Hold 1 TB of RAM )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Terabyte」の詳細全文を読む スポンサード リンク
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