Stackable storage. It's the ultimate space saver, making order out of chaotic cabinets, closets, attics and garages. But until recently it had not made its way into the realm of computers, where megabytes of data are scattered on the face of a disk like millions of shoes across a bedroom floor. Now a few big-name media makers, including Lucent Technologies and IBM, are making important strides in developing optical holography, which stacks information throughout the thickness of a storage medium, instead of just writing it to the surface.

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