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megabyte wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 definitions toggle definitions subsection 1 1 base 10 1 2 base 2 1 3 mixed 2 examples of use 3 see also 4 references 5 external links toggle the table of contents megabyte 65 languages afrikaans العربية azərbaycanca беларуская тарашкевіца беларуская български বাংলা català dansk deutsch ελληνικά esperanto español euskara فارسی français हिन्दी hrvatski հայերեն interlingua bahasa indonesia italiano 日本語 jawa ქართული қазақша 한국어 latviešu македонски मराठी bahasa melayu nederlands norsk nynorsk norsk bokmål polski پنجابی پښتو português română русский саха тыла sicilianu scots srpskohrvatski српскохрватски simple english slovenčina shqip српски srpski svenska kiswahili ślůnski தமிழ் тоҷикӣ ไทย türkçe татарча tatarça українська اردو oʻzbekcha ўзбекча tiếng việt winaray 吴语 ייִדיש 粵語 中文 edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects abstract wikipedia wikimedia commons wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia multiple of the unit byte this article is about the decimal unit of data for binary unit of 1024 2 bytes see mebibyte for other uses see megabyte disambiguation mbyte redirects here for the battery electric car from byton see byton m byte not to be confused with megabit megabyte a playstation 2 memory card has a capacity of 8 megabytes mb general information unit system unit derived from bit unit of digital information data size symbol mb multiple byte units v t e decimal binary value si value iec jedec 1000 10 3 kb kilobyte 1024 2 10 kib kibibyte kb kilobyte 1000 2 10 6 mb megabyte 1024 2 2 20 mib mebibyte mb megabyte 1000 3 10 9 gb gigabyte 1024 3 2 30 gib gibibyte gb gigabyte 1000 4 10 12 tb terabyte 1024 4 2 40 tib tebibyte tb terabyte 1000 5 10 15 pb petabyte 1024 5 2 50 pib pebibyte 1000 6 10 18 eb exabyte 1024 6 2 60 eib exbibyte 1000 7 10 21 zb zettabyte 1024 7 2 70 zib zebibyte 1000 8 10 24 yb yottabyte 1024 8 2 80 yib yobibyte 1000 9 10 27 rb ronnabyte 1024 9 2 90 rib robibyte 1000 10 10 30 qb quettabyte 1024 10 2 100 qib quebibyte orders of magnitude of data 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 1 000 000 10 6 in the international system of units si 1 therefore one megabyte is one million bytes of information this definition has been incorporated into the international system of quantities in the computer and information technology fields other definitions have been used that arose for historical reasons of convenience a common usage has been to designate one megabyte as 1 048 576 bytes 2 20 b a quantity that conveniently expresses the binary architecture of digital computer memory standards bodies have deprecated this binary usage of the mega prefix in favor of a new set of binary prefixes 2 by means of which the quantity 2 20 b is named mebibyte symbol mib definitions edit the unit megabyte is commonly used for 1000 2 one million bytes or 1024 2 bytes the interpretation of using base 1024 originated as technical jargon for the byte multiples that needed to be expressed by the powers of 2 but lacked a convenient name as 1024 2 10 approximates 1000 10 3 roughly corresponding to the si prefix kilo it was a convenient term to denote the binary multiple in 1999 the international electrotechnical commission iec published standards for binary prefixes requiring the use of megabyte to denote 1000 2 bytes and mebibyte to denote 1024 2 bytes by the end of 2009 the iec standard had been adopted by the ieee eu iso and nist nevertheless the term megabyte continues to be widely used with different meanings base 10 edit 1 mb 1 000 000 bytes 1000 2 b 10 6 b is the definition following the rules of the international system of units si and the international electrotechnical commission iec 2 this definition is used in computer networking contexts and most storage media particularly hard drives flash based storage 3 and dvds and is also consistent with the other uses of the si prefix in computing such as cpu clock speeds or measures of performance the mac os x 10 6 file manager is a notable example of this usage in software since snow leopard file sizes are reported in decimal units 4 in this convention one thousand megabytes 1000 mb is equal to one gigabyte 1 gb where 1 gb is one billion bytes base 2 edit main article mebibyte 1 mb 1 048 576 bytes 1024 2 b 2 20 b is the definition used by microsoft windows in reference to computer memory such as random access memory ram this definition is synonymous with the unambiguous binary unit mebibyte in this convention one thousand and twenty four megabytes 1024 mb is equal to one gigabyte 1 gb where 1 gb is 1024 3 bytes i e 1 gib mixed edit 1 mb 1 024 000 bytes 1000 1024 b is the definition used to describe the formatted capacity of the 1 44 mb 3 5 inch hd floppy disk which actually has a capacity of 1 474 560 bytes 5 randomly addressable semiconductor memory doubles in size for each address lane added to an integrated circuit package which favors counts that are powers of two the capacity of a disk drive is the product of the sector size number of sectors per track number of tracks per side and the number of disk platters in the drive changes in any of these factors would not usually double the size examples of use edit 1 44 mb floppy disks can store 1 474 560 bytes of data the full resolution image of this photograph of a floppy diskette is itself 0 842 megabytes depending on compression methods and file format a megabyte of data can roughly be a 1 megapixel bitmap image e g 1152 864 with 256 colors 8 bits pixel color depth stored without any compression 6 seconds of 44 1 khz 16 bit uncompressed cd audio 1 minute of 128 kbit s mp3 lossy compressed audio the novel the picture of dorian gray by oscar wilde hosted on project gutenberg as an uncompressed plain text file is 0 429 mb great expectations is 0 994 mb 6 and moby dick is 1 192 mb 7 the human genome consists of dna representing 800 mb of data the parts that differentiate one person from another can be compressed to 4 mb 8 see also edit timeline of binary prefixes gigabyte consumer confusion references edit si prefixes bureau international des poids et mesures archived from the original on june 7 2007 retrieved june 1 2007 1 2 definitions of the si units the binary prefixes national institute of standards and technology sandisk usb flash drive note 1 megabyte mb 1 million bytes 1 gigabyte gb 1 billion bytes how mac os x reports drive capacity apple inc 2009 08 27 retrieved 2009 10 16 tracing the history of the computer history of the floppy disk dickens charles july 1 1998 great expectations via project gutenberg melville herman july 1 2001 moby dick or the whale via project gutenberg christley s lu y li c xie x 2008 human genomes as email attachments bioinformatics 25 2 274 275 doi 10 1093 bioinformatics btn582 pmid 18996942 external links edit historical notes about the cost of hard drive storage space the megabyte established definition in networking and storage industries from whatis com international electrotechnical commission definitions iec prefixes and symbols for binary multiples archived 2004 06 15 at the wayback machine v t e units of information platform independent units bit hextet octet platform dependent units nibble byte syllable word metric bit units kilobit megabit metric byte units kilobyte megabyte gigabyte retrieved from https en wikipedia org w index php title megabyte oldid 1376022846 category units of information hidden categories articles with short description short description is different from wikidata webarchive template wayback links this page was last edited on 21 september 2026 at 15 09 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents megabyte 65 languages add topic
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