Kibibyte

From Wikipedia, the free encyclopedia

Prefixes for bit and byte
Decimal
Value SI
10001 k kilo-
10002 M mega-
10003 G giga-
10004 T tera-
10005 P peta-
10006 E exa-
10007 Z zetta-
10008 Y yotta-
Binary
Value IEC JEDEC
10241 Ki kibi- K kilo-
10242 Mi mebi- M mega-
10243 Gi gibi- G giga-
10244 Ti tebi-
10245 Pi pebi-
10246 Ei exbi-
10247 Zi zebi-
10248 Yi yobi-

A kibibyte (a contraction of kilo binary byte) is a unit of information or computer storage, established by the International Electrotechnical Commission in 2000. Its symbol is KiB.[1]

1 kibibyte = 210 bytes = 1,024 bytes

The kibibyte is closely related to the kilobyte, which can be used either as a synonym for kibibyte or to refer to 103 bytes = 1,000 bytes (see binary prefix).

Usage of these terms is intended to avoid the confusion, common in describing storage media, as to the ambiguous meaning of "kilobyte". Thus the term kibibyte has evolved to refer exclusively to 1,024 bytes.

The confusion if kilobyte is used to refer to both 1,000 and 1,024 bytes became more substantial when hard drives grew to gigabyte and larger units. If one expects power-of-two values to refer to capacity, and manufacturers use power-of-ten values, the difference could be substantial. With a kilobyte (1,024 versus 1,000), the difference is 2.4%. With the megabyte (1,024² or 1,048,576, versus 1,000,000) the percentage difference becomes 4.9%. With "gigabytes", if one uses 1024³, the size of a drive would be expected to be 1,073,741,824 bytes per gigabyte versus a mere 1,000,000,000 - a difference of 7.4%.

Confusion can be compounded by the use of both 1,024 and 1,000 in a single definition. The quoted capacity of 3½ inch HD floppy disks is 1.44 MB, where MB stands for 1000 times 1024 bytes. The total capacity is thus 1,474,560 bytes, or approximately 1.41 MiB.

[edit] Adoption

Adoption of this term has been limited, because in the most common applications (e.g., displaying file sizes, download speeds) typical values are not multiples of large powers of two, and therefore use of the decimal prefix "kilo" is more convenient.[2][3][4][5]

[edit] See also

[edit] Notes

  1. ^ International Electrotechnical Commission (2007). Prefixes for binary multiples. Retrieved on 2007-05-06.
  2. ^ Safier vs WDC complaint. Retrieved on 2007-11-15.
  3. ^ Rowlett, Prof. Russ (April 16, 2005). Metric Prefixes. University of North Carolina at Chapel Hill. Retrieved on 2007-11-15.
  4. ^ Simpson, Rick. Prefixes for binary multiples. Rice University. Retrieved on 2007-11-15.
  5. ^ Grainger, Brian (7 August, 2005). I'VE GOT A BIGGER GIGABYTE THAN YOU!. Independent Computer Products Users Group (ICPUG). Retrieved on 2007-11-15.