Article: What Is The Difference Between CD And DVD Media?
|
|
|
|
|
What Is The Difference Between CD And DVD Media?
Although both CD and DVD have the same media size and shape, the similarity ends there. There are numerous points of difference between the two, as listed below:
Data pits and lasers
A disc has microscopic grooves that move along in a spiral around the disc. Both CDs and DVDs have these grooves. Laser beams are applied to scan these grooves. As you may be aware, digital information is represented in ones and zeroes. In these discs, very tiny reflective bumps (called ?lands?) and non-reflective holes (called ?pits?), which are found alongside the grooves, reflect the ones and zeros of digital information.
Here lies the difference ? by reducing the wavelength of the laser (from the 780mm infrared light used in the CD) to 625mm or more infrared lig...
|
|
|
|
|
|
|
Home
|
Back To Articles Directory
|
|
|
Send your comments, Suggestions or
Queries regarding this site at roseindia_net@yahoo.com.
|
|
Copyright © 2006. All rights
reserved.
|
|