Protein-coated Disc

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The protein -coated disc (PCD) is an optical storage medium, the theory has been developed by Venkatesan Renugopalakrishnan at Harvard Medical School. In this case, a normal DVD with a protein derived from a bacterium of bacteriorhodopsin (BR) is coated, which produces a chemical substance as an energy storage at light. Its maximum storage capacity would be equivalent to 50 terabytes. Thus, their storage capacity would exceed those of the Blu -ray disc by a factor of 250. Together with the Japanese NEC Corporation, a prototype has already been developed. In the meantime, a series production had been promised in 2008, but currently no time frame is visible.


The storage medium is coated with a protein of the bacterium Halobacterium salinarum. Due to the extremely small size of the proteins of only a few nanometers, the storage capacity would be extremely increased. However, the durability of this protein is very limited. By manipulation of the DNA of the bacterium is to be effected, that such a storage medium usable for several years.