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In techspeak and jargon, the standard metric prefixes used in the SI (Système International) conventions for scientific measurement have dual uses. With units of time or things that come in powers of 10, such as money, they retain their usual meanings of multiplication by powers of 1000 = 10^3. But when used with bytes or other things that naturally come in powers of 2, they usually denote multiplication by powers of 1024 = 2^(10).
Here are the SI magnifying prefixes, along with the corresponding binary interpretations in common use:
prefix decimal binary kilo- 1000^1 1024^1 = 2^10 = 1,024 mega- 1000^2 1024^2 = 2^20 = 1,048,576 giga- 1000^3 1024^3 = 2^30 = 1,073,741,824 tera- 1000^4 1024^4 = 2^40 = 1,099,511,627,776 peta- 1000^5 1024^5 = 2^50 = 1,125,899,906,842,624 exa- 1000^6 1024^6 = 2^60 = 1,152,921,504,606,846,976 zetta- 1000^7 1024^7 = 2^70 = 1,180,591,620,717,411,303,424 yotta- 1000^8 1024^8 = 2^80 = 1,208,925,819,614,629,174,706,176
Here are the SI fractional prefixes:
prefix decimal jargon usage milli- 1000^-1 (seldom used in jargon) micro- 1000^-2 small or human-scale nano- 1000^-3 even smaller pico- 1000^-4 even smaller yet femto- 1000^-5 (not used in jargon---yet) atto- 1000^-6 (not used in jargon---yet) zepto- 1000^-7 (not used in jargon---yet) yocto- 1000^-8 (not used in jargon---yet)
The prefixes zetta-, yotta-, zepto-, and yocto- have been included in these tables purely for completeness and giggle value; they were adopted in 1990 by the '19th Conference Generale des Poids et Mesures'. The binary peta- and exa- loadings, though well established, are not in jargon use either --- yet. The prefix milli-, denoting multiplication by 1000^(-1), has always been rare in jargon (there is, however, a standard joke about the 'millihelen' --- notionally, the amount of beauty required to launch one ship). 'Femto' and 'atto' (which, interestingly, derive not from Greek but from Danish) have not yet acquired jargon loadings, though it is easy to predict what those will be once computing technology enters the required realms of magnitude.
There are, of course, some standard unit prefixes for powers of 10. In the following table, the 'prefix' column is the international standard suffix for the appropriate power of ten; the 'binary' column lists jargon abbreviations and words for the corresponding power of
prefix decimal binary pronunciation kilo- k K, KB, /kay/ mega- M M, MB, meg /meg/ giga- G G, GB, gig /gig/,/jig/
Confusingly, hackers often use K or M as though they were suffix or numeric multipliers rather than a prefix; thus "2K dollars", "2M of disk space". This is also true (though less commonly) of G.
Note that the formal SI metric prefix for 1000 is 'k'; some use this strictly, reserving 'K' for multiplication by 1024 (KB is thus 'kilobytes').
K, M, and G used alone refer to quantities of bytes; thus, 64G is 64 gigabytes and 'a K' is a kilobyte (compare mainstream use of 'a G' as short for 'a grand', that is, $1000). Whether one pronounces 'gig' with hard or soft 'g' depends on what one thinks the proper pronunciation of 'giga-' is.
Confusing 1000 and 1024 (or other powers of 2 and 10 close in magnitude) --- for example, describing a memory in units of 500K or 524K instead of 512K --- is a sure sign of the marketroid. One example of this: it is common to refer to the capacity of 3.5" (microfloppies) as '1.44 MB'. In fact, this is a completely bogus number. The correct size is 1440 KB, that is, 1440 * 1024 = 1474560 bytes. So the 'mega' in '1.44 MB' is compounded of two 'kilos', one of which is 1024 and the other of which is 1000. The correct number of megabytes would of course be 1440 / 1024 = 1.40625. Alas, this fine point is probably lost on the world forever.
Sources: Various books, the Internet, and various encyclopedias.
Kilder: Forskellige bøger, internettet og forskellige leksikoner.