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Stored bits: storage areas assigned to individual tips may be discerned in the image on top left, which shows that more than 80 percent of the 1,024 cantilevers of an experimental setup were able to write data (zoom to 12 storage areas at right). The close-ups (center) present 40 nm (nanometers) wide indentations at a "pitch" (distance between centers of neighboring indentations) of 120 nm (left) and 40 nm (right), the latter leading to areal density of ca. 400 gigabits per square inch. The same magnification factor has been applied to the image at the bottom, which demonstrates the potential for Terabit-per-square-inch density with 10-nm-diameter marks at a 20-nm pitch.
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