Binary Prefixes
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! Symbol !! Prefix !! Factor !! Factor | ! Symbol !! Prefix !! Factor !! Factor | ||
|- | |- | ||
| − | | | + | | Yi || yobi || 2<sup>80</sup> || 1208925819614629174706176 |
|- | |- | ||
| − | | | + | | Zi || zebi || 2<sup>70</sup> || 1180591620717411303424 |
|- | |- | ||
| Ei || exbi || 2<sup>60</sup> || 1152921504606846976 | | Ei || exbi || 2<sup>60</sup> || 1152921504606846976 | ||
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| Ki || kibi || 2<sup>10</sup> || 1024 | | Ki || kibi || 2<sup>10</sup> || 1024 | ||
|} | |} | ||
| + | |||
| + | ''kibi originates from '''ki'''lo'''bi'''nary'' | ||
== Bits/Bytes == | == Bits/Bytes == | ||
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| 10 Mib/s || 10485760 bits/second = 1310720 bytes/second (IEC) | | 10 Mib/s || 10485760 bits/second = 1310720 bytes/second (IEC) | ||
|} | |} | ||
| + | |||
| + | == Standards == | ||
| + | * IEC 60027-2:2005 | ||
| + | * IEEE 1541-2002 | ||
== See also == | == See also == | ||
Revision as of 22:29, 16 February 2007
SI Prefixes are not used in the computer world, things are a bit different:
Contents |
Commonly used
These prefixes are easily confused with SI Prefixes.
| Symbol | Prefix | Factor | Factor |
|---|---|---|---|
| P | peta | 250 | 1125899906842624 |
| T | tera | 240 | 1099511627776 |
| G | giga | 230 | 1073741824 |
| M | Mega | 220 | 1048576 |
| k | kilo | 210 | 1024 |
IEC 60027-2 / IEEE 1541-2002
IEC has adopted these prefixes to solve the confusion. These are not widely used (yet).
| Symbol | Prefix | Factor | Factor |
|---|---|---|---|
| Yi | yobi | 280 | 1208925819614629174706176 |
| Zi | zebi | 270 | 1180591620717411303424 |
| Ei | exbi | 260 | 1152921504606846976 |
| Pi | pebi | 250 | 1125899906842624 |
| Ti | tebi | 240 | 1099511627776 |
| Gi | gibi | 230 | 1073741824 |
| Mi | mebi | 220 | 1048576 |
| Ki | kibi | 210 | 1024 |
kibi originates from kilobinary
Bits/Bytes
| Symbol | Suffix | Description |
|---|---|---|
| b | bit | one binary digit, value 0 or 1 |
| B | Byte | 4-10 bits, but in most cases 8 bits |
| o | octet | 8 bits |
Examples
| Symbol | Prefix |
|---|---|
| 1 kB | 1024 bytes (but 1000 bytes according to SI) |
| 1 KiB | 1024 bytes (IEC) |
| 10 Mb/s | 10485760 bits/second = 1310720 bytes/second (but 1250000 bytes/seconds according to SI) |
| 10 Mib/s | 10485760 bits/second = 1310720 bytes/second (IEC) |
Standards
- IEC 60027-2:2005
- IEEE 1541-2002