A gigabyte or Gbyte (derived from the SI prefix giga-) is a unit of information or computer storage meaning either 1000³ bytes or 1024³ bytes (1000³ = one billion). The usage of the word "gigabyte" is ambiguous, depending on the context. When referring to RAM sizes and file sizes, it traditionally has a binary definition, of 1024³ bytes. For other uses, it means exactly 1000³ bytes. In order to address this confusion, currently the International Electrotechnical Commission (IEC) promotes the use of the term "gibibyte" for the binary definition. This position is endorsed by other standards organizations including the Institute of Electrical and Electronics Engineers (IEEE), the International Committee for Weights and Measures (CPIM) and the National Institute of Standards and Technology (NIST).
It is commonly abbreviated GB (not to be confused with Gb, which is used for gigabits).
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11:52 PM on November 28, 2007