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Digital data storage using volume holograms offers high density and fast readout. Current research concentrates on system design, understanding and combating noise, and developing appropriate storage materials. Possible applications include fast data servers and high-capacity optical disks. Has the rapid increase in available storage capacity fueled the demand for storage or vice versa? It’s hard to say: Computer users’ hard disk drives are perpetually overflowing with data, even though a year earlier the same-size disk seemed more than sufficient. Research into and development of data storage devices is a race to keep up with this continuing demand for more capacity, more density, and faster readout rates. Improvements in conventional memory technologies—magnetic hard disk drives, optical disks, and semiconductor memories—have managed to keep pace with the demand for bigger, faster memories. However, strong evidence indicates that these two-dimensional surface-storage technologies a