New generation DVD that can hold 10000 movies

A new type of disc that stores 10,000 times more data than current DVDs has been unveiled by Australia researchers. The discs store 8.5 gigabytes of data, pipping the capacity of current DVD and Blu-ray discs which hold up to 50 gigabytes.A standard DVD recorder uses light of a single wavelength to 'burn' data onto the surface of the disc. Researchers from Swinburne University of Technology in Melbourne found that by adding gold nanorods to the disc they were able to increase its capacity. The nanorods react to light according to their shape - thus allowing researchers to record information using light of different wavelengths, or colours, on the same location on the disc. The researchers also used polarisation, the angle of the light's electric field, to record data. Professor Min Gu, Director of the Centre for Micro-Photonics at Swinburne, who was also involved in the research, said: "We have created a new recording device that can respond to different colour and different polarisation. By using these properties we can use more of the disc." The researchers were able to record three layers of information, using three different wavelengths and two polarisations. Since publication, we have recorded 10 layers, and they believe it is possible to record 100 layers onto a single disc.