The IEC has adopted prefixes for binary powers in the international standard IEC 60027-2: 2005, third edition, Letter symbols to be used in electrical technology - Part 2: Telecommunications and electronics. They should not be used to indicate powers of 2 (for example, one kilobit represents 1000 bits and not 1024 bits). These SI prefixes refer strictly to powers of 10. The International System of Units (SI) (PDF) (in French and English) (8th ed.).
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^ a b c d e f Part of the beginning of the prefix was modified from the word it was derived from, ex: "peta" (prefix) vs "penta" (derived word).The introduction of the CGS system was in 1873. ^ Prefixes adopted before 1960 already existed before SI.gigayear or gigaannum-one billion (10 9) years, sometimes abbreviated Gyr, but the preferred usage is Ga.gigabyte-for instance, for hard disk capacity, 120 GB = 120 000 000 000 bytes.gigabit- bandwidth of a network link, for instance, 1 Gbit/s = 1 000 000 000 bit/s.gigahertz- clock rate of a CPU, for instance, 3 GHz = 3 000 000 000 Hz.Wells found that 84% of Britons preferred the pronunciation of gigabyte starting with /ɡɪ/ (as in gig), 9% with /dʒɪ/ (as in jig), 6% with /ɡaɪ/ ( guy), and 1% with /dʒaɪ/ (as in giant).
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In 1998, a poll by the phonetician John C. Self was unable to ascertain when the /dʒ/ (soft g) pronunciation came into occasional use, but claimed that as of 1995 it had returned to /ɡ/ (hard g). This suggests that a hard German was originally intended as the pronunciation. Ī prominent example of this latter pronunciation is found in the pronunciation of gigawatts in the 1985 film Back to the Future.Īccording to the American writer Kevin Self, a German committee member of the International Electrotechnical Commission proposed giga as a prefix for 10 9 in the 1920s, drawing on a verse (evidently "Anto-logie") by the German humorous poet Christian Morgenstern that appeared in the third (1908) edition of his Galgenlieder (Gallows Songs). In English, the prefix giga can be pronounced / ˈ ɡ ɪ ɡ ə/ (a hard g as in giggle), or / ˈ dʒ ɪ ɡ ə/ (a soft g as in giant, which shares giga 's Ancient Greek root).