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For comparison, he explained, imagine normal magnetic sensors can read a signal that begins with a strength of 1 and swings between an "off" reading at 0.8 and "on" at 1.2. The new sensors can read a range that swings between minus 1000 and plus 1000. That degree of sensitivity means terabits of data -- or trillions of bits -- could be crammed into a square inch of disk space. About 160 terabits comprise the entire contents of the Library of Congress.