The fourth-generation optical disc that replaces the Blu-ray Disc format will require terabyte-class capacity.
Holographic memory was long regarded as the main candidate for this role, but its development has not been realized. Prof. Inoue research group successfully put a Holographic Versatile Disc (HVD) based on the collinear holography technique into practical use. The HDV format is expected to be able to hold over 1.3 terabytes of information on a CD-size disc in the future. This paper attempts at giving a brief overview of 4G optical discs technologies, and an introduction to protein coated disk technology in particular, its potential, likely adoption and evolution, how the MOD may benefit from it and recommendations for actions the MOD may want to take with respect to it (PCD) appearing on the scene. It does not attempt to go into the technical details of the PCD technology since its sole purpose is to draw interest and highlight its potential.
Over the years, optical storage density has been increased in the first 3 generations by shortening the wavelength of light used to read and write however fourth generation optical discs have deviated from the trend by not going in for shorter wavelength lasers but for a variety of large-capacity optical disc technologies including near-field recording, super-resolution, recording, multilayer recording, and holographic data storage. The following section list and describes the current 4G optical discs technologies. Protein Coated Disk (PCD) is a theoretical optical disc technology currently being developed. It entails covering a regular DVD with a special light-sensitive protein, which would in theory permit storage of up to 50 Terabytes on one disc.
Challenges
Two main challenges face PCD implementation these are: the development of thin overcoats that would protect the protein films from an environment and ensure an adequate lifetime of the memory device; and the technology to provide adequate power in a nanoscale beam spot for reading and writes. However, Renugopalakrishnan team and NEC have succeeded in creating a prototype for such a disc, they think it can be used for hard drives and USB drives for the future.
Today, work on PCD technology has been abandoned with no clear reason for this given by the media or researchers.
Holographic memory was long regarded as the main candidate for this role, but its development has not been realized. Prof. Inoue research group successfully put a Holographic Versatile Disc (HVD) based on the collinear holography technique into practical use. The HDV format is expected to be able to hold over 1.3 terabytes of information on a CD-size disc in the future. This paper attempts at giving a brief overview of 4G optical discs technologies, and an introduction to protein coated disk technology in particular, its potential, likely adoption and evolution, how the MOD may benefit from it and recommendations for actions the MOD may want to take with respect to it (PCD) appearing on the scene. It does not attempt to go into the technical details of the PCD technology since its sole purpose is to draw interest and highlight its potential.
Over the years, optical storage density has been increased in the first 3 generations by shortening the wavelength of light used to read and write however fourth generation optical discs have deviated from the trend by not going in for shorter wavelength lasers but for a variety of large-capacity optical disc technologies including near-field recording, super-resolution, recording, multilayer recording, and holographic data storage. The following section list and describes the current 4G optical discs technologies. Protein Coated Disk (PCD) is a theoretical optical disc technology currently being developed. It entails covering a regular DVD with a special light-sensitive protein, which would in theory permit storage of up to 50 Terabytes on one disc.
Challenges
Two main challenges face PCD implementation these are: the development of thin overcoats that would protect the protein films from an environment and ensure an adequate lifetime of the memory device; and the technology to provide adequate power in a nanoscale beam spot for reading and writes. However, Renugopalakrishnan team and NEC have succeeded in creating a prototype for such a disc, they think it can be used for hard drives and USB drives for the future.
Today, work on PCD technology has been abandoned with no clear reason for this given by the media or researchers.
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