Metric prefixes are also used for random-access memory capacity, such as main memory and CPU cache size, due to the prevalent binary addressing of memory.
The binary interpretation of metric prefixes is still prominently used by the Microsoft Windows operating system. The usage of the metric prefix kilo for binary multiples arose as a convenience, because 1024 is approximately 1000. The term 'kilobyte' has traditionally been used to refer to 1024 bytes (2 10 B).
One thousand kilobytes (1000 kB) is equal to one megabyte (1 MB), where 1 MB is one million bytes. The IEC 80000-13 standard uses the term 'byte' to mean eight bits (1 B = 8 bit). It is also consistent with the other uses of the SI prefixes in computing, such as CPU clock speeds or measures of performance. This definition, and the related definitions of the prefixes mega ( 1 000 000), giga ( 1 000 000 000), etc., are most commonly used for data transfer rates in computer networks, internal bus, hard drive and flash media transfer speeds, and for the capacities of most storage media, particularly hard drives, flash-based storage, and DVDs. This is the definition recommended by the International Electrotechnical Commission (IEC). In the International System of Units (SI) the prefix kilo means 1000 (10 3) therefore, one kilobyte is 1000 bytes. This arises from the prevalence of sizes that are powers of two in modern digital memory architectures.ĭefinitions and usage Base 10 (1000 bytes) In some areas of information technology, particularly in reference to solid-state memory capacity, kilobyte instead typically refers to 1024 (2 10) bytes. The internationally recommended unit symbol for the kilobyte is kB. The International System of Units (SI) defines the prefix kilo as 1000 (10 3) per this definition, one kilobyte is 1000 bytes. The kilobyte is a multiple of the unit byte for digital information.
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