There is a technology by which the DVD can store up to 7, 2 terabytes of information

It's all about technology. Regular DVD contain information written in the manner of a vinyl record, on the two-track. Shortwave laser denser "packages" information on Blu-ray, but the principle is the same. Developers are trying to do "multi-layer" discs to even tighter "ram" on the disc contents.

Researcher James Chon of Melbourne has developed a completely different technology. It offers manufacturers more sophisticated laser system based on the use of a set of different wave polarizations and the laser beam. This technology will greatly increase the amount of storage on disk.

By itself, this system is not complicated. Difficulties arose with the choice of a suitable material for the production. The authors concluded that the best way to cope with the task of gold nanorods in different sizes and different orientations. When recording laser "podplavlyaet" only the rods, which is the same direction as the direction of polarization, remaining rods remain intact. Thus it is possible in the same area to record several different data sets.

via factroom.ru