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M-DISC (Millennial Disc) is a write once optical disc technology available in DVD and Blu-ray forms. == Overview == M-DISC's design is intended to provide greater archival media longevity.〔("Final Report for Millenniata DVD Testing August 2009-October 2009" ), ''Naval Air Warfare Center Weapons Division''. Retrieved 10 November 2009.〕 Millenniata claims that properly stored M-DISC recordings will last 1000 years.〔(Front Page )〕 While the exact properties of M-DISC are a trade secret,〔(mDisc Review )〕 the patents protecting the M-DISC technology assert that the data layer is a "glassy carbon" and that the material is substantially inert to oxidation and has a melting point between 200° and 1000 °C.〔("Optical data storage media containing substantially inert low melting temperature data layer US 8389095 B2" ), ''Patent US 8389095''. Retrieved 25 September 2014.〕〔("Long-term digital data storage US 7613869 B2" ), ''Patent US 7613869''. Retrieved 25 September 2014.〕 A stress test of the media was performed by the United States Department of Defense, proving at the very least that M-Disc DVDs and Blu-rays are more durable than conventional DVDs and Blu-rays. "The discs were subject to the following test conditions in the environmental chamber: 85°C, 85% relative humidity (conditions specified in ECMA-379) and full spectrum light".〔("75 page breakdown of the D.O.D.'s findings" )〕〔("2 page summary of DOD's findings" )〕 Conventional DVD-R and BD-R LTH (Low To High) use recording layers of organic dye and separate reflective layers.〔See CD-R for an overview〕 Standard (HTL) BD-R and BD-R/DL typically use inorganic data layers, but continue using a reflective layer. M-DISC uses a single inorganic recording layer, which is substantially inert to oxygen, but requires a higher-powered laser. M-DISC does not require the reflective layer. Thus, both the M-DISC and inorganic BD-R physically alter the recording layer, burning a permanent hole in the material. Besides physical damage, failure of the reflective layer, followed closely by degradation of the data layer, are the primary failure modes of all optically recordable disks. Recorded discs are readable in conventional drives. LG Electronics, ASUS and Lite-On 〔("Lite-On eBAU108 Product Information" )''Lite-On Corp''. Retrieved 19 February 2014.〕 produce drives which can record M-DISC media. Ritek produces M-DISC Blu-ray disc media, sold under the Imation, Ritek and M-DISC brands. Verbatim produces co-branded discs, marketed as the "Verbatim M-Disc".〔("Millenniata Archiving Blu-ray M-Disc Available in Spring 2013" ) ''StorageNewsletter.com''. Retrieved 10 January 2013.〕〔("M-Disc's list of devices that can write )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「M-DISC」の詳細全文を読む スポンサード リンク
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