Term Papers on CD BURNER

Term Paper Title	CD BURNER
# of Words	687
# of Pages (250 words per page double spaced)	2.75

CD BURNER

With the Napster boom in the late 90s came a market for cd burners.Record companies began to lose millions due to this while electronic companies began to cash.People needed a way of transferring their music. Sales of cd burners, CD-R (cd-recordable) and CD-RW (cd re-writeable) skyrocketed. Today a CD-burner comes as standard in a modern PC.DVD burners are not uncommon in modern PCs either. Prices for cd burners are falling dramatically because of mass production due to high demand.

CDs store music and other types of information digitally.it uses the binary numeric system(only counts with 1s and 0s).Tiny bumps are arranged in a continuous track.The track measures .5 of a micron wide(millionth of a metere) and 3.5 miles long if stretched out.To collect this information the cd player shines a laser on the surface of the cd.When it passes over a flat area of the cd the player recognises it as a 1.When the laser passes over a bump it is recognises it as a 0.This data is then processed by the cd player and is heard as digital sound.

Fig 1.

To record a cd a high powered laser is used.A layer of photo-resistant material is applied to the cd.The laser is shun onto this material with high intensity which in turn creates bumps on the surface of the cd.Then an aluminum coating is placed over the photo-resistant material.This allows the laser to be reflected back onto a sensor once the laser goes over a bump.A plastic layer is then placed over the cd.This is for protection against scratches and dust.Other more protective layers have been invented but have not been put into production due to cost.

Fig 2.

During the 90s floppy discs were the only way of extracting information from a computer.Their memory was limited(only 1MB).With this high demand CD-Rs(CD Recordable discs) were c...

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