FACTOID # 10: The total number of state executions in 2005 was 60: 19 in Texas and 41 elsewhere. The racial split was 19 Black and 41 White.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Fluorescent Multilayer Disc

Fluorescent Multilayer Disc (FMD), is an optical disc format developed by Constellation 3D 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 allows FMDs to have up to 100 layers. These extra layers allow FMDs to have capacities up to a terabyte, while maintaining the same physical size of traditional optical discs. The optical lens of a compact disc drive. ... Constellation 3D (C3D or CDDD)[1] was the worldwide leader in the development of high capacity Fluorescent Multilayer Disc and Card (FMD/C) technology. ... Fluorescence induced by exposure to ultraviolet light in vials containing various sized Cadmium selenide (CdSe) quantum dots. ... The reflection of a bridge in Indianapolis, Indianas Central Canal. ... CD may stand for: Compact Disc Canadian Forces Decoration Cash Dispenser (at least used in Japan) CD LPMud Driver Centrum-Demokraterne (Centre Democrats of Denmark) Certificate of Deposit České Dráhy (Czech Railways) Chad (NATO country code) Chalmers Datorförening (computer club of the Chalmers University of Technology) a 1960s... DVD (Digital Versatile Disc or Digital Video Disc) is an optical disc storage media format that can be used for data storage, including movies with high video and sound quality. ... This article is about a measurement term for data storage capacity. ...

An example of an FMD

Contents

Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ...

Operating principles

The pits in an FMD are filled with fluorescent material. When coherent light from the laser strikes a pit the material glows, giving off incoherent light of a different wavelength. Since FMDs are clear, this light is able to travel through many layers unimpeded. The clear discs, combined with the ability to filter out laser light (based on wavelength and coherence), yield a much greater signal-to-noise ratio than reflective media. This is what allows FMDs to have many layers. The main limitation on the number of layers in a FMD is the overall thickness of the disc. Fluorescence induced by exposure to ultraviolet light in vials containing various sized Cadmium selenide (CdSe) quantum dots. ... Coherent waves. ... Experiment with a laser (US Military) In physics, a laser is a device that emits light through a specific mechanism for which the term laser is an acronym: Light Amplification by Stimulated Emission of Radiation. ... Coherence is from Latin cohaerere = stick together, to be connected with, logically consistent. ... The wavelength is the distance between repeating units of a wave pattern. ... Signal-to-noise ratio (often abbreviated SNR or S/N) is an electrical engineering concept defined as the ratio of a signal power to the noise power corrupting the signal. ...


Development

A 50 GB prototype disc was demonstrated at the COMDEX industry show in November 2000. First generation FMDs were to use 650 nm red lasers, yielding roughly 140 GB per disc. Second and third generation FMDs were to use 405 nm blue lasers, giving capacities of up to a terabyte. A gigabyte (derived from the SI prefix giga-) is a unit of information or computer storage equal to one billion (short scale) bytes or 230 bytes (1024 mebibytes)[1]. It is commonly abbreviated GB (not to be confused with Gb, which is used for gigabits). ... It has been suggested that this article or section be merged with prototyping. ... COMDEX (Computer Dealers Exhibition) was a computer expo held in Las Vegas, Nevada, each November from 1979 to 2003. ... 2000 : January - February - March - April - May - June - July - August - September - October - November - December This is a timeline for events in November, 2000. ...


After Constellation 3D shut down due to a scandal (the scandal essentially involved the prototype "demonstrated" at COMDEX 2000 being a hoax — the content was actually playing on a hard drive — the device was faked) and the company consequently ran out of money, a new company called D Data Inc. was formed which acquired the entire patent portfolio of Constellation 3D in 2003. The company is determined to bring multilayer optical disc technology to the market, and so has introduced the technology again under the new name of Digital Multilayer Disk (DMD). A patent portfolio is a collection of patents filed and owned by a single inventor or corporation that may be related or unrelated. ... 2003 (MMIII) was a common year starting on Wednesday of the Gregorian calendar. ... Digital Multilayer Disk (DMD) is an optical disc format developed by D Data Inc. ...


See also

Using the same technology as the fluorescent multilayer disc, the fluorescent multilayer card is a card containing a square shaped clear part which has multiple layers each with a different fluorescent material that reflects light at a different frequency than the other layers, so that the number of layers is... Dr. Eugen Pavel is a Romanian scientist and the inventor of the Hyper CD-ROM, a 3D optical data storage medium with a claimed initial capacity of 10 TB and with a theoretical capacity of 1 PB[1] on a single disc. ...

External links


  Results from FactBites:
 
Fluorescent Multilayer Disc - Wikipedia, the free encyclopedia (347 words)
Fluorescent Multilayer Disc (FMD), is an optical disc format developed by Constellation 3D that uses fluorescent, rather than reflective materials to store data.
The main limitation on the number of layers in a FMD is the overall thickness of the disc.
A 50 GB prototype disc was demonstrated at the COMDEX industry show in November 2000.
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m