Most people understand the relative size of their digital files. That report you just saved is 318 kilobytes (KB); those vacation photos tally 750 megabytes (MB); your new iPod holds 20 gigabytes (GB)...
of music. When data sets start to grow, however, their sizes become more difficult to explain. How much does a terabyte (TB) hold? How many DVDs would it take to reach a zettabyte? And what on earth is a yottabyte?
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