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Ultra Density Optical
Ultra Density Optical (UDO) is an optical disc format designed for high-density storage of high-definition video and data.
== Overview ==
An Ultra Density Optical disc or UDO is a 133.35 mm (5.25") ISO cartridge optical disc which can store up to 30 GB of data. The second generation UDO2 media was introduced in April 2007 and has a capacity of up to 60 GBs. Utilising a design based on a Magneto-optical disc, but using Phase Change technology combined with a blue violet laser, a UDO/UDO2 disc can store substantially more data than a magneto-optical disc or MO, because of the shorter wavelength (405 nm) of the blue-violet laser employed. MOs use a 650 nm-wavelength red laser. Because its beam width is shorter when burning to a disc than a red-laser for MO, a blue-violet laser allows more information to be stored digitally in the same amount of space.
Current generations of UDO2 media store up to 60 GB.〔(【引用サイトリンク】 Plasmon Launches UDO2 )〕 According to Plasmon, desktop UDO2 drives are priced at around US $5400.〔(【引用サイトリンク】 UDO frequently asked questions. )〕
A 30 GB UDO2 Write Once is US $75.〔(【引用サイトリンク】 UDO frequently asked questions. )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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