BYBY SIDDHARTH SIDDHARTH

SHANBHAG SHANBHAG

FLUROSCENT MULTILAYER FLUROSCENT MULTILAYER DISC DISC

FLUORESCENT FLUORESCENT MULTILAYER DISCMULTILAYER 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?Why FMD?

• Increased disc Capacity.Increased disc Capacity.• Quick parallel access and retrieval Quick parallel access and retrieval

information.information.• Media tolerances.Media tolerances.• Usage Flexibility.Usage Flexibility.

Operating Principle:Operating Principle:• The principle operation of FMD is based on a The principle operation of FMD is based on a phenomenon of phenomenon of photochromismphotochromism. .

• The laser beam when focused on the The laser beam when focused on the informationinformation

material the material starts material the material starts radiatingradiating than than reflecting.reflecting.

• The laser beam causes theThe laser beam causes the photochrome photochrome material material

to posses the to posses the fluorescentfluorescent properties . properties .

• The fluorescence is caught up by a device calledThe fluorescence is caught up by a device calledphotophoto receiverreceiver..

• The The usage ofusage of photochrome materialphotochrome material with increasing with increasing

the number of information layers do not make the signal the number of information layers do not make the signal

worse which is not in case of other optical discs. worse which is not in case of other optical discs.

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

• This technology prevents the This technology prevents the problem ofproblem of interference interference

since we are using photochrome material which posses since we are using photochrome material which posses

the fluorescent properties.the fluorescent properties.

Model of FMD:Model of FMD:

Comparison of Disc Layers:Comparison of Disc Layers:

Technological Process:Technological Process:

• Hot StampingHot Stamping:The layer is pressed with :The layer is pressed with polycarbonatepolycarbonate

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

filledfilledwith fluorescent material.with fluorescent material.

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

polymeric polymeric material.material.

Advantages of FMD:Advantages of FMD:

• Prevents problem of interference since it uses Prevents problem of interference since it uses an an

incoherent fluorescent light.incoherent fluorescent light.• Compatible with CD and DVD formats with Compatible with CD and DVD formats with

more more

storage area and faster access.storage area and faster access.• Fluorescent technology do not require special Fluorescent technology do not require special

manufacturing conditions.manufacturing conditions.• The technological advantages.The technological advantages.

Applications:Applications:

• Data warehouses.Data warehouses.• E-commerce related data mining.E-commerce related data mining.• HDTV.HDTV.• Mobile phones and PDA.Mobile phones and PDA.• PVRPVR

CD vs DVD vs FMD: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:Conclusion:

The rapid technological development that is takingThe rapid technological development that is takingplace in storage devices has also made the man think place in storage devices has also made the man think about the needs and the requirements for the about the needs and the requirements for the

storage storage devices.devices.But 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:References:

• www.en.wikipedia.org/wiki.www.en.wikipedia.org/wiki.• www.ixbtlabs.com/articles . www.ixbtlabs.com/articles . • www.seminartopic.org.www.seminartopic.org.• www.ebook-search-engine.com/www.ebook-search-engine.com/

fluroscent-multilayer-disc.fluroscent-multilayer-disc.

What’s Next?What’s Next?

• About the company.About the company.• Working.Working.• Types.Types.• Development.Development.• Disadvantages.Disadvantages.