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Step 1: What kind of measurement do you want to compare?
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Length
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Weight
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Speed
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Time
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Area
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Equivalents in other units


How much is 516 petabytes?

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It's about eight times as much as The Books in the Library of Congress.
In other words, the amount of The Books in the Library of Congress is 0.1 times 516 petabytes.
(2009 figures) (digitized entire collection)
It's about ten times as much as Mozy.
In other words, the amount of Mozy is 0.1 times 516 petabytes.
(2009 figures) (total file storage)
It's about one-tenth as much as The Internet.
In other words, the amount of The Internet is 10 times 516 petabytes.
(2005 figures) (estimated)
It's about 100 times as much as The Letters Delivered by the Postal Service in 2010.
In other words, the amount of The Letters Delivered by the Postal Service in 2010 is 0.01 times 516 petabytes.
(2010 figures)
It's about 150 times as much as Netflix's Watch Instantly catalog.
In other words, 516 petabytes is 164 times the amount of Netflix's Watch Instantly catalog, and the amount of Netflix's Watch Instantly catalog is 0.0061 times that amount.
(May, 2013 figures)
It's about 200 times as much as a Human Brain.
In other words, 516 petabytes is 210 times the amount of a Human Brain, and the amount of a Human Brain is 0.0048 times that amount.
According to Northwestern University psychology professor Paul Reber, the capacity of the human brain is a theoretical 2.5 petabytes. Each lobe of the brain consists of folded neural tissue with a total area, if unfolded, of about 0.24 sq. m.
It's about 200 times as much as The US Census Bureau.
In other words, 516 petabytes is 210 times the amount of The US Census Bureau, and the amount of The US Census Bureau is 0.0048 times that amount.
(a.k.a. United States Census Bureau, a.k.a. Bureau of the Census) (2010 figures) (total active data)