Multiples of bytes  


 
Orders of magnitude of data 
The gibibyte is a multiple of the unit byte for digital information. The binary prefix gibi means 2^{30}, therefore one gibibyte is equal to 1073741824bytes = 1024 mebibytes. The unit symbol for the gibibyte is GiB. It is one of the units with binary prefixes defined by the International Electrotechnical Commission (IEC) in 1998.^{ [1] }^{ [2] }
The gibibyte is closely related to the gigabyte (GB), which is defined by the IEC as 10^{9} bytes = 1000000000bytes, 1GiB ≈ 1.074GB. 1024 gibibytes are equal to one tebibyte. In the context of computer memory, gigabyte and GB are customarily used to mean 1024^{3} (2^{30}) bytes, although not in the context of data transmission and not necessarily for hard drive size.^{ [3] }
Hard drive and SSD manufacturers use the gigabyte to mean 1000000000 bytes. Therefore, the capacity of a 128 GB SSD is 128000000000 bytes. Expressed in gibibytes this is about 119.2 GiB. Some operating systems, including Microsoft Windows, display such a drive capacity as 119 GB, using the SI prefix G with the binary meaning. No space is missing: the size is simply being expressed in a different unit, even though the same prefix (G) is used in both cases.
The use of gigabyte (GB) to refer to 1000000000 bytes in some contexts and to 1073741824 bytes in others, sometimes in reference to the same device, has led to claims of confusion, controversies, and lawsuits.^{ [4] }^{ [5] }^{ [6] }^{ [7] } The IEC created the binary prefixes (kibi, mebi, gibi, etc.) in an attempt to reduce such confusion. They are increasingly used in technical literature and opensource software, and are a component of the International System of Quantities.^{ [8] }
A binary prefix is a unit prefix for multiples of units in data processing, data transmission, and digital information, notably the bit and the byte, to indicate multiplication by a power of 2.
The gigabyte is a multiple of the unit byte for digital information. The prefix giga means 10^{9} in the International System of Units (SI). Therefore, one gigabyte is one billion bytes. The unit symbol for the gigabyte is GB.
Giga ( or ) is a unit prefix in the metric system denoting a factor of a (shortform) billion (10^{9} or 1000000000). It has the symbol G.
The kilobyte is a multiple of the unit byte for digital information.
The megabyte is a multiple of the unit byte for digital information. Its recommended unit symbol is MB. The unit prefix mega is a multiplier of 1000000 (10^{6}) in the International System of Units (SI). Therefore, one megabyte is one million bytes of information. This definition has been incorporated into the International System of Quantities.
The mebibyte is a multiple of the unit byte for digital information. The binary prefix mebi means 2^{20}; therefore one mebibyte is equal to 1048576bytes, i.e., 1024 kibibytes. The unit symbol for the mebibyte is MiB.
The tebibyte is a multiple of the unit byte for digital information. It is a member of the set of units with binary prefixes defined by the International Electrotechnical Commission (IEC). Its unit symbol is TiB.
The exbibyte (symbol EiB) is 2^{60} bytes of digital information. It is one of a set of units with binary prefixes defined by the International Electrotechnical Commission (IEC).
The kibibyte is a multiple of the unit byte for quantities of digital information. The binary prefix kibi means 2^{10}, or 1024; therefore, 1 kibibyte is 1024 bytes. The unit symbol for the kibibyte is KiB.
The pebibyte is a multiple of the unit byte for digital information. It is a member of the set of units with binary prefixes defined by the International Electrotechnical Commission (IEC). Its unit symbol is PiB.
The gigabit is a multiple of the unit bit for digital information or computer storage. The prefix giga (symbol G) is defined in the International System of Units (SI) as a multiplier of 10^{9} (1 billion, short scale), and therefore
The gibibit is a multiple of the bit, a unit of information, prefixed by the standardsbased multiplier gibi (symbol Gi), a binary prefix meaning 2^{30}. The official unit symbol of the gibibit is Gibit. The alternative Gib is sometimes used.
A unit prefix is a specifier or mnemonic that is prepended to units of measurement to indicate multiples or fractions of the units. Units of various sizes are commonly formed by the use of such prefixes. The prefixes of the metric system, such as kilo and milli, represent multiplication by powers of ten. In information technology it is common to use binary prefixes, which are based on powers of two. Historically, many prefixes have been used or proposed by various sources, but only a narrow set has been recognised by standards organisations.
File size is a measure of how much data a computer file contains or, alternately, how much storage it consumes. Typically, file size is expressed in units of measurement based on the byte. By convention, file size units use either a metric prefix or a binary prefix.
The yobibyte is a multiple of the unit byte for digital information. It is a member of the set of units with binary prefixes defined by the International Electrotechnical Commission (IEC). Its unit symbol is YiB
IEEE 15412002 is a standard issued in 2002 by the Institute of Electrical and Electronics Engineers (IEEE) concerning the use of prefixes for binary multiples of units of measurement related to digital electronics and computing.
The zebibyte is a multiple of the unit byte for digital information. It is a member of the set of units with binary prefixes defined by the International Electrotechnical Commission (IEC). Its unit symbol is ZiB.
ISO 80000 or IEC 80000 is an international standard promulgated jointly by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC).
This article presents a timeline of binary prefixes used to name memory units, in comparison of decimal and binary prefixes for measurement of information and computer storage.
In computing and telecommunications, a unit of information is the capacity of some standard data storage system or communication channel, used to measure the capacities of other systems and channels. In information theory, units of information are also used to measure the entropy of random variables and information contained in messages.