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As popularely used, these prefixes mean similar, but not equal factors than their SI counterparts, specifically they are whole powers of two, while SI prefixes are powers of ten. The exact numbers are listed below: |
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As popularly used, these prefixes indicate multiplies that are similar, but not equal to, factors denoted by their SI counterparts. Specifically, popular usage in computing denotes whole powers of two, while SI prefixes are powers of ten. The exact numbers are listed below: |
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It is widely regarded as confusing that common usage of kilobyte means 1024 bytes, while the "currect" value is 1000 bytes. Harddisk? manufacturers are the only group in computing that habitually uses the lower SI factors, so what is advertised as a 30 GB harddisk will actually only hold about 28 * 2^30 bytes. |
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These are identical to SI prefixes, except for "K", which is lowercase in SI. |
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In 1999 the IEC? published Amendment 2 to "IEC 60027-2: Letter symbols to be used in electrical technology - Part 2: Telecommunications and electronics". |
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It is widely regarded as confusing that common usage of kilobyte means 1024 bytes, while the "correct" value is 1000 bytes. Hard disk manufacturers are the only group in computing that habitually uses the lower SI factors, so what is advertised as a 30 GB harddisk will actually only hold about 28 * 2^30 bytes. Telecommunications also uses the SI factors, so a 1 Mbps connection transfers 10^6 bits per second. Floppy disk manufacturers are even more confusing. The prefix "M" means (1000 * 1000) in SI, and (1024 * 1024) in standard computing. However, the standard "1.44MB" floppy holds (1.44 * 1000 * 1024) bytes. In 1999 the IEC? published Amendment 2 to "IEC 60027-2: Letter symbols to be used in electrical technology - Part 2: Telecommunications and electronics". |
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As of 2001 these terms have not yet gained widespread use. |
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As of 2001 these terms have not yet gained widespread use. |
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