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A holographic disk isn’t much bigger than a DVD, but it holds 30 times as much data. A gel-like film inside stores bytes throughout its entire depth, not just in one or two flat layers. A laser burns a checkered pattern—representing 0s and 1s—into the film at several angles, packing in more information. The first drives and 300-gigabyte disks, available this year, are aimed at pro archives; consumer versions arrive in a few years. $18,000; inphase-technologies.com
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