What's the difference between CD & BD "blue ray" ? Need help with my school project?

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What's the difference between CD & BD "blue ray" ? Need help with my school project?

I need some help with my school project
What's the difference between CD & BD ?
Can someone please write me a small comparison between them including their capacity, when were they made, what are they used for....etc

Thanks
 
This is all you need for your project:

Blu-Ray uses a blue-violet laser as opposed to the red laser used on DVDs. This allows Blu-Ray discs to hold a lot more information on them than DVDs.

This increase in the amount of information that can be stored on a disc allows you to put High-Definition movies on a disc and not run out of space, since the average HD movie will take up about 15-20 GB of space.

If you have not seen an HD movie yet I would suggest stopping by your local Best Buy or Circuit City and looking at a Blu-Ray display. The images are sharper, brighter, and more detailed than any DVD movie. What manufacturers are trying to do is make the movie look as close to what you see in a real theater as possible, except for its a tenth the size and in your home.

Blu-Rays cannot be played in a traditional DVD player, which means that you will eventually have to buy a blu-ray player. However, all blu-ray players can play DVDs, and they upscale the images to look better on an HD screen, up to 1080p

So, while you will have to get a new Blu-Ray player to play HD movies, you can still see all of your current DVDs on the same player, and they'll be enhanced.

In essence, Blu-Ray will replace DVD just as DVD replaced VHS and the CD replaced the Casette Tape.


It's not my answer, but it's such a good answer I decided to post it for this question...
 
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