Resumen
The article focuses on storing data inside the volume of the recording medium, rather than on its surface, as in conventional optical and magnetic approaches. These systems deliver much higher data-transfer rates and access based on partial information. Holographic data storage records information in the form of volumetric gratings within the volume of the recording medium. In digital holographic storage, information is typically encoded in the form of 2-dimension pixelated images that include 2-dimension modulation coding, data shuffling and error correction. A multitude of holograms can be recorded in virtually the same volume through angular, wavelength or shift-and-correlation multiplexing techniques. Unlike conventional storage techniques, holographic data storage uses the entire volume, rather than just the surface, of the recording medium, greatly increasing potential data density. The page organization of such memory provides tremendous parallelism, resulting in far greater data-transfer rates than in conventional optical or magnetic storage.