lizytalk
2022-07-05 16:39:02 +08:00
维基百科上关于这一段历史的解释：
# Units based on powers of 10
Definition of prefixes using powers of 10—in which 1 kilobyte (symbol kB) is defined to equal 1,000 bytes—is recommended by the International Electrotechnical Commission (IEC).[27] The IEC standard defines eight such multiples, up to 1 yottabyte (YB), equal to 10008 bytes.[28]
This definition is most commonly used for data-rate units in computer networks, internal bus, hard drive and flash media transfer speeds, and for the capacities of most storage media, particularly hard drives,[29] flash-based storage,[30] and DVDs[citation needed]. Operating systems that use this definition include macOS,[31] iOS,[31] Ubuntu,[32] and Debian.[33] It is also consistent with the other uses of the SI prefixes in computing, such as CPU clock speeds or measures of performance.
# Units based on powers of 2
A system of units based on powers of 2 in which 1 kibibyte (KiB) is equal to 1,024 (i.e., 210) bytes is defined by international standard IEC 80000-13 and is supported by national and international standards bodies (BIPM, IEC, NIST). The IEC standard defines eight such multiples, up to 1 yobibyte (YiB), equal to 10248 bytes.
An alternate system of nomenclature for the same units (referred to here as the customary convention), in which 1 kilobyte (KB) is equal to 1,024 bytes,[34][35][36] 1 megabyte (MB) is equal to 10242 bytes and 1 gigabyte (GB) is equal to 10243 bytes is mentioned by a 1990s JEDEC standard. Only the first three multiples (up to GB) are mentioned by the JEDEC standard, which makes no mention of TB and larger. The customary convention is used by the Microsoft Windows operating system[37][better source needed] and random-access memory capacity, such as main memory and CPU cache size, and in marketing and billing by telecommunication companies, such as Vodafone,[38] AT&T,[39] Orange[40] and Telstra.[41]
This definition was used by Apple Inc. operating systems prior to Mac OS X Snow Leopard and iOS 10 before switching to units based on powers of 10.[31]