FLUROSCENT MULTILAYER DISC

FLUORESCENT MULTILAYER DISC

What is FMD?Fluorescent Multilayer disc is an optical disc

that uses fluorescent rather than reflective material to store data.

It is an three dimensional storage disc developed by Constellation 3D.

Why FMD?Increased disc Capacity.Quick parallel access and retrieval

information.Media tolerances.Usage Flexibility.

Operating Principle:The principle operation of FMD is based on a phenomenon of photochromism. The laser beam when focused on the informationmaterial the material starts radiating than

reflecting.The laser beam causes the photochrome

material to posses the fluorescent properties . The fluorescence is caught up by a device calledphoto receiver.

The usage of photochrome material with increasing the number of information layers do not make the signal worse which is not in case of other optical discs.

The developers state that with blue laser(480nm) it is possible to increase density up to Terabytes on the disc.

This technology prevents the problem of interference since we are using photochrome material which posses the fluorescent properties.

Model of FMD:

Comparison of Disc Layers:

Technological Process:Hot Stamping:The layer is pressed with

polycarbonateand stamped twice with hot temperature. This results in two information layer with pits on each side and

filledwith fluorescent material.

Photoploymerisation:This process is carried out in order to prevent a physical contact with information layer on the edge of the disc this is filled with

polymeric material.

Advantages of FMD:Prevents problem of interference since it uses an

incoherent fluorescent light.Compatible with CD and DVD formats with

more storage area and faster access.Fluorescent technology do not require special manufacturing conditions.The technological advantages.

Applications:Data warehouses.E-commerce related data mining.HDTV.Mobile phones and PDA.PVR

CD vs DVD vs FMD:PARAMETERPARAMETERSS

CDCD DVDDVD FMDFMD

1. Disc 1. Disc diameter diameter

120mm120mm 120mm120mm 120mm120mm

2. Capacity 2. Capacity 750MB750MB 4GB 4GB 50GB+50GB+

3. Wavelength3. Wavelength 780nm780nm 650nm650nm 480-480-530nm530nm

4. Distance 4. Distance b/w tracksb/w tracks

1.6micro1.6micronn

0.85micro0.85micronn

0.80micr0.80micronon

5.No.of layers5.No.of layers 11 22 1212

Conclusion:The rapid technological development that is takingplace in storage devices has also made the man think about the needs and the requirements for the storage devices.But for now the FMD, which can provide us with gigabytes(GB) of storage space compared to CD and DVD seems to be an enticing solution for the storage masses.

References:www.en.wikipedia.org/wiki.www.ixbtlabs.com/articles . www.seminartopic.org.www.ebook-search-engine.com/fluroscent-

multilayer-disc.

What’s Next?About the company.Working.Types.Development.Disadvantages.

Thank You