Byte
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A byte is a unit of measurement for quantifying amounts of data.
Stats
Multiple-byte units
Units based on powers of 10
- kilobyte
- (a.k.a. KB) 103 = 1,000 bytes.
- megabyte
- (a.k.a. MB) 106 = 1,000,000 bytes.
- gigabyte
- (a.k.a. GB) 109 = 1,000,000,000 bytes.
- terabyte
- (a.k.a. TB) 1012 = 1,000,000,000,000 bytes.
- petabyte
- (a.k.a. PB) 1015 = 1,000,000,000,000,000 bytes.
- exabyte
- (a.k.a. EB) 1018 = 1,000,000,000,000,000,000 bytes.
Units based on powers of 2
The following unit names were first approved by IEC in 1998-12 and published in 1999-01 under Amendment 2 to IEC International Standard IEC 60027-2: Letter symbols to be used in electrical technology - Part 2: Telecommunications and electronics. The amendment was incorporated into the second edition of IEC 60027-2 published on 2000-11. [1]
- kibibyte
- (a.k.a. KiB) 210 = 1,024 bytes.
- mebibyte
- (a.k.a. MiB) 220 = 1,048,576 bytes.
- gibibyte
- (a.k.a. GiB) 230 = 1,073,741,824 bytes.
- tebibyte
- (a.k.a. TiB) 240 = 1,099,511,627,776 bytes.
- pebibyte
- (a.k.a. PiB) 250 = 1,125,899,906,842,624 bytes.
- exbibyte
- (a.k.a. EiB) 260 = 1,152,921,504,606,846,976 bytes.
Notable violators
- Microsoft Windows
- File Explorer defines 1 KB = 210 bytes.
History
- 2000-11-22: IEC publishes the second edition of IEC 60027-2: Letter symbols to be used in electrical technology - Part 2: Telecommunications and electronics which incorporates a 1999-12 ammendment recommending the “kibibyte”/”KiB”, etc. binary prefix convention.[4]
See also
External links
References
- ↑ “Prefixes for binary multiples”. (n.d.). The NIST Reference on Constants, Units, and Uncertainty. Accessed 2023-07-02. Archived from the original on 1999-10-01. “…the name of each new prefix is derived from the name of the corresponding SI prefix by retaining the first two letters of the name of the SI prefix and adding the letters "bi," which recalls the word "binary." Similarly, the symbol of each new prefix is derived from the symbol of the corresponding SI prefix by adding the letter "i," which again recalls the word "binary." ”.
- ↑ “Amazon S3 pricing”. (n.d.). Amazon Web Services. Accessed 2023-07-02. Archived from the original on 2023-06-16. “Amazon S3 storage usage is calculated in binary gigabytes (GB), where 1 GB is 230 bytes. This unit of measurement is also known as a gibibyte (GiB), defined by the International Electrotechnical Commission (IEC). Similarly, 1 TB is 240 bytes, i.e. 1024 GBs.”.
- ↑ “Using PHP”. (n.d.). php.net. Accessed 2023-06-13. “Note: kilobyte versus kibibyte. The PHP notation describes one kilobyte as equalling [sic] 1024 bytes, whereas the IEC standard considers this to be a kibibyte instead. Summary: k and K = 1024 bytes.”.
- ↑ “Letter symbols to be used in electrical technology - Part 2: Telecommunications and electronics”. (2000-11-22). IEC Webstore. Accessed 2023-07-02. Archived from the original on 2016-04-29.
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