![]() 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. A kibibyte is defined by IEC 80000-13 as 1024 bytes.ĭefinitions and usage Base 10 (1000 bytes) This arises from the prevalence of sizes that are powers of two in modern digital memory architectures, coupled with the coincidence that 2 10 differs from 10 3 by less than 2.5%. 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 a multiplication factor of 1000 (10 3) therefore, one kilobyte is 1000 bytes. The kilobyte is a multiple of the unit byte for digital information.
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