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Everybody has a CD of something whether it be of their favorite band or something that Great Aunt Edna sent you for your birthday on how to look smarter. (I hope you returned that for something better!) Well, this is all about how those CD's work. CD stands for compact disc. A CD has to hold more than seven hundred
eighty three megabytes on one small disc with a diameter of twelve
centimeters! If you look at a CD, you probably wouldn't suspect
that. A CD is made out of plastic four one hundreths of an inch
thick. While being maunfactured, the plastic gets impressions of
microscopic bumps put in a single, extremely long, spiral line.
This line of bumps is data. The reflective side of the CD is put
over the bumps so that they will not get destroyed. The bumps are
about five tenths of a micron wide and are a minimum of eighty three
tenths of a micron long. Now do you understand why your favorite
game no longer works when it gets scratched? If the track of bumps
were taken off the CD and stretched out in a straight line, it would
be three and a half miles long. Today we use CDs for the enjoyment
of music and for recording. You have to agree that it's amazing
what you can do with a simple piece of plastic! |
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