DVD,+CD,+VR,+stereolithography

What are CDs DVDs and what is stereolithography?
CD's and DVD's and stereolithography are all ways of mass production for products or data. CD's and DVD's are disks that can contain masses of information which can be reproduced easily. Steriolithography is a technique of creating high quality products with high accuracy and precision. The benefits of these kinds of technology is the fact that they can all be mass produced cheaply and easily. CD's (compact disc) can usually hold up to 700mb of data on a single disc and DVD's (digital versatile disk) can have capacities of over, 8GB's of information. More benefits of CD's and DVD's are that they are usually small and portable and usually very cheap. This is very important because these factors have helped to make cd's and DVD's the most popular forms of data storage and distribution used today.

History of CD's DVD's and Stereolithography
CD's first came out and were first available for purchase in 1982. It was originally made as a means of storing audio data and the basic idea and concept of audio storage and playback is still very similar today as it was when it was first created. Since the release of the CD, many other types of CD's have also been released such as the CD-Rom, VCd etc. Cd's are one of the most popular forms of media storage today and there have been over 200 billion CD's sold since its release. DVD, stands for digital versatile disk came out several years after the CD. It is similar in size but can hold up to six times as much information as a normal CD. The development of the DVD used today was supported by several companies including Toshiba, Hitachi, Thopmson and JVC. Stereolithography was first coined in 1986 byCharles W. Hull and it was originally defined as a method of making solid items by printing several layers of thin material over and over. Laser Prototypes (Europe) Ltd and Formation Ltd were two of the first companies to use this kind of technology and they started using it shortly after its release.

Ethical Social Issues
One of the main issues or problems wioth using this kind of technology is acctually also one of the reasons its so good and popular. Cd,s DVD's and Stereolithography can all be easily and cheaply reproduced and data can easily be manipulated and copied. Many people today create fake copies of music cd's or DVD movies and sell them for prices lower than originals. Because CD's and DVD's are so easy to copy, fake DVD's and cds are very common. Another issue that there is with using DVD's and CD's is the reliability of using them. Often CD's and DVD's can become unreadable just by being scratched and is is very easy to scratch CD's or DVD's that do not have covers or protection. Also, CD's and DVD's will become unusable of they are bent or cracked.

Sources:
Wikipedia the free encyclopedia, stereothilography, October 2008, 