I have had numerous queries regarding why hard drive capacities are constantly smaller than the amount they are advertised to include. The dissimilarity in capacities is suitable to two dissimilar methods for defining what accurately the prefixes mega, giga, tera mean. In the system world, these prefixes encompass dissimilar meanings depending on what accurately I am talking regarding. Hard drive producer report the size of hard drives using the decimal classification of these terms (10^6, 10^9, 10^12 correspondingly), whereas operating systems and additional software use the binary definition of these terms (2^20, 2^30, 2^40).
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