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Fluorescent Multilayer Disc: Difference between revisions

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Revision as of 14:15, 2 February 2021 edit176.234.10.61 (talk)No edit summary← Previous edit Latest revision as of 10:33, 2 July 2022 edit undoFelix QW (talk | contribs)Extended confirmed users8,573 edits Blanking and redirecting to 3D optical data storage per proposal at Talk:3D optical data storage#Merger proposal. See also Talk:3D optical data storage#Blanking and redirecting Fluorescent Multilayer Disc and Digital Multilayer Disk to here.Tags: New redirect 2017 wikitext editor 
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{{Infobox storage medium
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| type = ]
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| capacity = 50 ]s <small>(prototype)</small><br>1 ] <small>(hypothetical)</small>
| blocksize =
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| write =
| standard =
| owner = ]
| use = ]
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{{Optical disc authoring}}
'''Fluorescent Multilayer Disc''' ('''FMD''') is an ] format developed by ] at early 2000's that uses ], rather than ] materials to store data. Reflective disc formats (such as ] and ]) have a practical limitation of about two layers, primarily due to interference, scatter, and inter-layer cross talk. However, the use of fluorescence allowed FMDs to operate according to the principles of ] and have up to 100 data layers. These extra layers potentially allowed FMDs to have capacities of up to a ], while maintaining the same physical size of traditional optical discs.


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==Operating principles==
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The pits in an FMD are filled with fluorescent material. When ] from the ] strikes a pit the material glows, giving off ] light of a different ]. Since FMDs are clear, this light is able to travel through many layers unimpeded. The clear discs, combined with the ability to filter out laser light (based on wavelength and coherence), yield a much greater ] than reflective media. This is what allows FMDs to have many layers. The main limitation on the number of layers in an FMD is the overall thickness of the disc.

==Development==
A 50 ] ] disc was demonstrated at the ] industry show in November 2000. First generation FMDs were to use 650 nm red lasers, yielding roughly 140 GB per disc. Second and third generation FMDs were to use 405 nm blue lasers, giving capacities of up to a terabyte.

D Data, Inc. acquired the ] of Constellation 3D in 2003, with plans to reintroduce the technology under the new name ] (DMD).

==See also==
* ]
* ]

{{Homevid}}

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