There is now a unit of measure to hold nearly all the world’s digital output. Behold: the zettabyte. One zettabyte is equal to 1 million petabytes, or 1,000,000,000,000,000,000,000 individual bytes. As a frame of reference, an average mp3 is about 375,000 bytes or 3 MB. Why do we need a larger unit to measure...

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