What are some unique features of the archive? How large is a terabyte?
The archive stores about five years worth of satellite and aerial imagery, or 100 terabytes. Space Imaging’s automated “robot” stores digital tapes for about 90 days before they are placed into the longer term archive. The robot has quick access to tapes containing about 10 terabytes worth of imagery. To put “terabyte” into perspective: One terabyte is equivalent to about 1.6 million books. The U.S. Library of Congress houses an estimated 30 terabytes of “book” data, or about one third of the data stored in Space Imaging’s archive.
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