02-02-2010, 03:01 PM
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INTRODUCTION
Fluorescent Multilayer Disc (FMD) is an optical disc format It was developed by a company called constellation 3D (C3D). that uses fluorescent, rather than reflective materials to store data. Reflective disc formats (such as CD and DVD) 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 3D optical data storage and have up to 100 data layers. These extra layers potentially allowed FMDs to have capacities of up to a terabyte, while maintaining the same physical size of traditional optical discs.
It is an optical format similar in size and appearance to regular CD-ROMs and DVDs but with storage capacity up to 140GB. Production of these discs is easily done with slight modification to that of CDs and DVDs, its relatively cheaper.
submitted by
Monika Pratap
FMD Principle
Data is stored on multiple layers unlike CDs or DVDs where
single layers are used.
Recording, reading and storing is done with help of fluorescent
materials embedded in pits or groves in each of the layers.
The fluorescent material emits radiation when excited by an
external light source.
This allows the information to be decoded by the changes in the
intensity and color of the emitted radiation.
FMD Technology
FMD technology, each storage layer is coated with a transparent
fluorescent material.
When the laser beam hits a mark on a layer, fluorescent light is
emitted.
The light emitted by fluorescent light is incoherent, not being
affected by data pits or other marks in the media, and passes
through adjacent data layers unaltered.
Salient features
In FMD devices, emitted light is filtered before it reaches the drive's detector.
This reduces the effect of stray light and interference - only data-conveying fluorescent light is detected.
The signal quality of conventional optical reflection systems degrades rapidly when additional data layers are added.
The filtered, incoherent light of FMD and FMC technology offers the potential for storage mediums with up to 100 data layers.
INTRODUCTION
Fluorescent Multilayer Disc (FMD) is an optical disc format It was developed by a company called constellation 3D (C3D). that uses fluorescent, rather than reflective materials to store data. Reflective disc formats (such as CD and DVD) 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 3D optical data storage and have up to 100 data layers. These extra layers potentially allowed FMDs to have capacities of up to a terabyte, while maintaining the same physical size of traditional optical discs.
It is an optical format similar in size and appearance to regular CD-ROMs and DVDs but with storage capacity up to 140GB. Production of these discs is easily done with slight modification to that of CDs and DVDs, its relatively cheaper.
submitted by
Monika Pratap
FMD Principle
Data is stored on multiple layers unlike CDs or DVDs where
single layers are used.
Recording, reading and storing is done with help of fluorescent
materials embedded in pits or groves in each of the layers.
The fluorescent material emits radiation when excited by an
external light source.
This allows the information to be decoded by the changes in the
intensity and color of the emitted radiation.
FMD Technology
FMD technology, each storage layer is coated with a transparent
fluorescent material.
When the laser beam hits a mark on a layer, fluorescent light is
emitted.
The light emitted by fluorescent light is incoherent, not being
affected by data pits or other marks in the media, and passes
through adjacent data layers unaltered.
Salient features
In FMD devices, emitted light is filtered before it reaches the drive's detector.
This reduces the effect of stray light and interference - only data-conveying fluorescent light is detected.
The signal quality of conventional optical reflection systems degrades rapidly when additional data layers are added.
The filtered, incoherent light of FMD and FMC technology offers the potential for storage mediums with up to 100 data layers.
