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01/22/2002 Entry: "22-Jan-2002 -- How the Wayback Machine Works"

How the Wayback Machine Works -- "In the Wayback Machine, currently there are 10 billion Web pages, collected over five years. That amounts to 100 terabytes, which is 100 million megabytes. So if a book is a megabyte, which is about what it is, and the Library of Congress has 20 million books, that's 20 terabytes. This is 100 terabytes. At that size, this is the largest database ever built. It's larger than Walmart's, American Express', the IRS."

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