The Microholas project developed a microholographic recording technique, using nanostructures inside the disk rather than on the surface as in conventional optical storage systems.Source: The Register.
This allowed for an increase of the storage capacity far beyond the limits of today's red-laser DVDs and next-generation blue-laser discs.
A single-layer Blu-ray Disc can hold 25GB. A dual-layer disc holds double this amount. Single- and dual-layer HD DVDs hold 15GB and 30GB of data, respectively.
By applying wavelength multiplexing techniques to multi-layer disc structures, very high storage densities can be achieved, Professor Susanna Orlic told German site Pressetext. The 500GB prototype has 50 data-storage layers.
European researchers squeeze 500GB on a DVD
Posted on Tuesday, Jul 10 2007 @ 06:12 CEST by Thomas De Maesschalck
Scientists from the University of Berlin, Budapest University of Technology and Politecnica delle Marche in Italy, have managed to develop a way to store 500GB or even 1TB of data on a regular HD DVD or Blu-ray disc.