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FLUORESCENT MULTI-LAYER DISC(FMD):

FLUORESCENT MULTI-LAYER DISC(FMD):. A Breakthrough in Optical Data Storage By- GUNJAN CHAUDHARY EC-3 rd YEAR N.I.E.C. INTRODUCTION. In mid 1990’s,the company Constellation 3D ,in New York City demonstrates a new format: FMD (Fluorescent Multilayer Disk)

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FLUORESCENT MULTI-LAYER DISC(FMD):

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  1. FLUORESCENT MULTI-LAYER DISC(FMD): A Breakthrough in Optical Data Storage By- GUNJAN CHAUDHARY EC-3rd YEAR N.I.E.C.

  2. INTRODUCTION • In mid 1990’s,the company Constellation 3D ,in New York City demonstrates a new format: FMD (Fluorescent Multilayer Disk) • Constellation 3D's technology implements the concept of the volumetric storage of information. • (FMD) is a multi-layer, readable and re-writable disc. • It has the same diameter and thickness as a CD or DVD. • Its transparent nature is one of its most recognizable Features. • The data is stored on fluorescent materials in multiple layers, which give off light.

  3. OPTICAL STORAGE MEDIA USED TODAY CD-ROM • With a 640-MB storage capacity, data access speeds are reasonable, maximum data transfer rates are approximately 5Mbps. • Data bits are permanently stored on a CD in the form of physically molded pits in the surface of a plastic data layer that is coated with reflective aluminum.

  4. OPTICAL STORAGE MEDIA USED TODAY DVD ROM • DVD-ROM technology provides 7 times the storage capacity of CD discs. • The distance between recording tracks is less than half that used for CDs, pit size also is less which requires a reduced laser wavelength to read the smaller-sized pits. • DVD discs can also store two layers of data because they can have a translucent reflective layer with data on top of a second opaque reflective layer containing more data. • DVDs allow a maximum of 18 GB of data storage in a dual-layer, dual-sided configuration with a data transfer rate of 10 Mbps.

  5. Structure of CD and DVD • CDs and DVDs • have similar compositions consisting of • a label, • a protective layer, • a reflective layer (aluminum, silver, or • gold), • a digital-data layer molded in polycarbonate, • a thick • polycarbonate bottom layer

  6. FLUORESCENT MULTI-LAYER DISC OVERVIEW • The limitation of CD and DVD is that the laser cannot accurately penetrate the solid, reflective layer where data is stored. • In the case of DVD, the laser can penetrate one layer deep to read the second layer, but after that, the laser becomes diffused and unable to read the data clearly. • FMD-ROM is a totally clear disc. Instead of reading a single layer, the data is stored on fluorescent materials in multiple layers, which give off light. • The five-inch disc, which is the same size as CD-ROMs and DVD-ROMs, can hold up to 140GB of data -- almost 30 times the capacity of a DVD-ROM disc.

  7. FLUORESCENT MULTI-LAYER DISC • Figure shows how an FMD looks like. • We can see that a disc is transparent. • But where is a reflective layer like on CD and DVD discs?

  8. FLUORESCENT MULTI-LAYER DISC TECHOLOGY OVERVIEW • In FMD there is no reflected laser beam: when a laser beam reaches an informational layer the latter starts radiating. • The principle of operation of FM-discs is based on a phenomenon of photochromism. • Some years ago Russian chemists discovered a stable organic material a "stable photochrome" which when acted upon by a laser beam obtains fluorescent properties. • The matter is that an informational element of FM-disc (photochrome) can change its physical properties (such as color and presence of fluorescence) under influence of a laser of a definite power and wavelength.

  9. FLUORESCENT MULTI-LAYER DISC • Initially photochrome doesn't possess fluorescent properties. • When switching on a laser a photochemical reaction starts what causes fluorescent properties to appear. • When reading, this matter becomes excited again but with a laser of lower power. The fluorescence is caught up by a photo-receiver and is fixed as a value "1". • Besides, according to the company there will be no worsening of the photochrome state with the time.

  10. FLUORESCENT MULTI-LAYER DISC • Figure shows how the laser beam strikes and get deflected from the surface of a • Fluorescent Multi Layer Disk

  11. FLUORESCENT MULTI-LAYER DISC • It could be seen that the laser beam of same wave length falling on the FMD surfaces get deflected in different wave lengths • This technology allows preventing a problem of multiple inference between layers since the reflected light is not coherent; it passes through layers without any difficulties and is easily defined by a receiver.

  12. FLUORESCENT MULTI-LAYER DISC • In the fig. a disc consists of several plastic (polycarbone) layers connected to each other. • A layer contains surface structures (pits), which are filled with • fluorescent material. • When reading a laser focuses on a certain layer and excites its fluorescent elements, and then a photo detector catches this radiation. • The developers state that with a blue laser (480 nm) it's possible to increase record • density up to tens Terabyte on one FM disc.

  13. FLUORESCENT MULTI-LAYER DISC • Another interesting feature is parallel reading, which will be dealt later. If we record a sequence of bits not along a track but deep into layers we can increase speed of data access. • That's why such disc is called "3-dimensional".

  14. FLUORESCENT MULTI-LAYER DISC Advantages of FMD: • Multilayer disc is transparent and homogeneous. • Small loss of useful signal while passing through several layers. • Fluorescence of a separate element easily passes through disc layers. • Less sensitivity (than of CD/DVD) to different imperfections of reading devices. Fluorescent technology doesn't require special manufacturing conditions. • Reflective fluorescent light from any layer is not coherent, it prevents a problem of multiple interferences. • FMD-technology is compatible with CD and DVD formats supporting the same data distribution system on each layer.

  15. FLUORESCENT MULTI-LAYER DISC • FMD READ DEVICES • You can see a prototype of an FMD Read Device in figure. • The developers say that • the drives intended for FM discs will easily understand CD and DVD format. • In structure the drives are similar to CD/DVD ones for example in such parameters as laser, optics, • servo drive, tracking and focusing system, different controllers. • There appear only • systems that can catch and discern fluorescence, and a service in choosing an • informational layer.

  16. FLUORESCENT MULTI-LAYER DISC THE TECHOLOGICAL ADVATAGES INCREASED DISC CAPACITY • DVD data density (4.7 GB) on each layer of data is up to 100 layers. Initially, the FMD disc will hold anywhere from 25 - 140 GB of data depending on market need. Eventually a terabyte of data on a single disc will be achievable. QUICK PARALLEL ACCESS AD RETRIEVAL OF IFORMATION • Reading from several layers at a time and multiple tracks at a time – nearly impossible using the reflective technology of a CD/DVD - is easily achieved in FMD.This will allow for retrieval speeds of up to 1 gigabit/second. MEDIA TOLERACES • By using incoherent light to read data the FMD media will have far fewer restrictions in temperature range, vibration and air-cleanness during manufacturing. And will provide a considerably more robust data carrier than existing CD and DVD’s. USAGE FLEXIBILITY • FMD presents a wide variety of potential media sizes and types (read only,writeable and rewritable) for a broad range of applications

  17. FLUORESCENT MULTI-LAYER DISC POTETIAL FOR FURTHER GROWTH • The technology is young and will grow and evolve, providing a clear road map for the future of data storage. • The FMD/C technology is presently protected by over 80 Japanese, European, and US patents, approved and/or pending, dozens of priority establishing disclosures, and the exceptional know-how of an unprecedented group of physicists cooperating across the world.

  18. FLUORESCENT MULTI-LAYER DISC APPLICATIONS NEW APPLICATIONS REQUIRED CAPACITY • Digital cinema, High Definition TV 100GB • Mobile computing 5GB • Digital Cameras 5GB • Digital Video Recorders 40GB • G3 Mobile Phones 0.5GB

  19. FLUORESCENT MULTI-LAYER DISC COCLUSION Man’s need for additional storage space is something that is ever increasing. Hence no solution or data storage media is expected to achieve the status of a complete storage solution for long periods of time especially due to rapid developments taking place in many storage related fields. But for now the FMD, which can provide us with a staggering 140 GB of storage space seems to be an enticing solution for the storage hungry masses.

  20. COMPARISON BETWEEN CD DVD and FMD

  21. THANK YOU…

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