Monday, October 20, 2014
Search
  
Submit your own News for
inclusion in our Site.
Click here...
Breaking News
SK Telecom and Samsung Join Hands to Lead 5G Network Technology
Pantech Applied for Bankruptcy Protection In The US
IBM To Offload Chip Business To Globalfoundries: report
Microsoft To Launch A Wearable Device Soon
FCC To Explore High-frequency Wireless Technologies
Mozilla Hello Offers Voice and Video Calls Through The Browser
Samsung Adds Intel Processor To Chromebook 2
LG Ultra-Portable HD MiniBeam Projector Features Built-in Battery
Active Discussions
How to generate lots of different CDs quickly
Yamaha CRW-F1UX
help questions structure DVDR
Made video, won't play back easily
Questions durability monitor LCD
Questions fungus CD/DVD Media, Some expert engineer in optical media can help me?
CD, DVD and Blu-ray burning for Android in development
IBM supercharges Power servers with graphics chips
 Home > News > Optical Storage > Scienti...
Last 7 Days News : SU MO TU WE TH FR SA All News

Friday, December 19, 2008
Scientists Develop New Way to Distinguish Between Replicated and Duplicated CDs


Scientists at the University o

The method, which has been published in the American Journal of Physics, allows scientists to spot whether or not a CD is an original or a copy.

Professor Jose Fernandez-Dorado, described a simple diffraction method to distinguish between the two types of CDs, a distinction that is not visible to the eye. The success of this method is based on the different ways in which data are pressed onto the replicated CDs and burnt onto their duplicated counterparts.

The diffraction experiment can be performed by directing a laser beam with a wavelength peak at 632.8 nm on any part of the surface of a CD except the center or edge, where no information is stored. The light is diffracted after being reflected from the microstructures of the surface, which contain the information. The diffraction patterns of replicated CDs and of CD-Rs are distinct, allowing scientists to easily spot the copied and possibly counterfeited CD.







"We have tested more than 100 CDs of different makes with different types of audio and video data and have found that the method is completely reliable," Jose Fernandez-Dorado said.

The technique has also been tested in DVDs and the scientists intend to develop it for Blu-ray as well.


Previous
Next
First Hybrid Blu-ray/DVD Movie Title Announced For Japan        All News        EA Releases SimCity for the iPhone
First Hybrid Blu-ray/DVD Movie Title Announced For Japan     Optical Storage News      Philips Reaches Consensus with Ritek and CMC

Get RSS feed Easy Print E-Mail this Message

Most Popular News
 
Home | News | All News | Reviews | Articles | Guides | Download | Expert Area | Forum | Site Info
Site best viewed at 1024x768+ - CDRINFO.COM 1998-2014 - All rights reserved -
Privacy policy - Contact Us .