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In page Information Age:

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The world's technological capacity to store information grew from 2.6 (optimally compressed) exabytes (EB) in 1986 to 15.8 EB in 1993; over 54.5 EB in 2000; and to 295 (optimally compressed) EB in 2007.[2][3] This is the informational equivalent to less than one 730-megabyte (MB) CD-ROM per person in 1986 (539 MB per person); roughly four CD-ROM per person in 1993; twelve CD-ROM per person in the year 2000; and almost sixty-one CD-ROM per person in 2007.[2] It is estimated that the world's capacity to store information has reached 5 zettabytes in 2014,[4] the informational equivalent of 4,500 stacks of printed books from the earth to the sun.[citation needed]