1 / 21

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)

kenny
Télécharger la présentation

FLUORESCENT MULTI-LAYER DISC(FMD):

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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…

More Related