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Cd roms (Click to select text)
CD:ROM drives are the thing of the future. CD:ROMs are used in almost every computer around the world. CD:ROM stands for COMPACT DISK READ ONLY MEMORY. That means that you can only read information off the disk. Three and a half disks are disks that you can read and wriye infromation from. Five and a quarter can do the same thing , but do not hold as much information. Five and a quarter disketts are very old. they stopped making those a while ago. In the ninteen ninty's they are totally outdated becaus of the lack of space they have and the lack of speed. A CD:ROM can hold more information than both of them put together. CD:ROMs hold up to four hundred megabytes of information. That is about half of what an average hard drive holds up to today. A hard drive is what all the information you install in to your computer goes. Inside a hard drive it looks like large CD:ROM , but this one is magnetic. If you open one up it will look like egular record player. The needle is what writes the information onto the hard drive. The needle writes by the magnetic force that pushes it down on to the disk. Once it is on the hard drive , whenever you turn on your computer the information is always there for you when you need it. A CD:ROM looks like a music compact disk , but they are not that much alike. First a CD:ROM has a lot more information than a regular compact disk. A CD:ROM has audio as well as visual information. Second a CD:ROM stores more data in it. Third if you put a CD:ROM in a compact disk player the compact disk player would just sit there and act stupid. If you put a compact disk in a CD:ROM drive it would play the compact disk you put in it because the CD:ROM drive is taught to do that also. Fourth to record music onto a compact disk you would have to buy the equipment. The equipment for that operation would cost around two thousand dollars just for the cheapest one. That does not include the compact disks you need to record on. Those compact disks cost around eighteen dollars for a basic one length recording disk. If you want to go and record infofmation on a CD:ROM it wold be much more expensive. The only only people who do these kind of things are the people who write the the programs. there are also buisnesses who do this operation to send their inrormation to client and investors so they they know what is happening in the buisness because this is easier than putting it on paper because the CD:ROM disk is smaller and is easier to use. This hardware is much more expensive than an audio compact disk writer. This machine will cost you well over five thousand dollars.This is not including the CD:ROMs which are very hard to find. The CD:ROMs cost around twenty seven dollars for four hundrend megabytes.That's why only rich people and some bisnesses those machines. CD:ROM drives have many parts that do many things. The fist part is the tray. The tray is the thing that that you put the CD:ROM on. Once it is on the tray the is usually a button that you press that makes it go in. When it is inside the CD:ROM drive it is taken off the tray.When it is inside a laser reads it. The laser is a low powered infra-red light. The laser shines on to the disk by reflecting it. The laser is reflected by a shiny semi-transparent foil.This foil is kind of chrome looking. The foil has information written on it. The information is written on the CD:ROM in concentric circles. If you looked at it with a microscope you little funny looking grooves in it. The grooves are the CD:ROM's own language. Whenever the laser is shot on to the disk it sends a small amount of voltage. The voltage is in the infra-red light that carries the information back to the laser eye. When it goes back into the laser eye it gets transferred back inside the computer where it is brought on to the moniter screen. Next there is the motor. The motor makes the CD:ROM spin at the the different speeds it has. The CD:ROM drive has many different speeds. the speeds vary on which CD:ROM drive you choose to get. After that there is a arm that picks up the CD:ROM. The arm picks it up and puts it on the motor. CD:ROM drives come in many styles , sizes , shapes , colors , and speeds. A CD:ROM drve basically comes in two styles. The most common style is internal CD:ROM drive. An internal CD:ROM drive is right inside your computer. An internal drive is some times better than an external drive because because it takes up less room on the outside of your computer. one thin that is bad abot it is that it take up foom inside of the computer. Some computers do not have a lot of boxes to your install hardware. Most computers have at least two boxes. If you only have two boxes you can only have a three and a half drive and a CD:ROM drive or a five and a quarter drive and a three and a half drive. With the new computers you do not need a five and a quarter drive because they are pieces of crap anyways. An external drive drive does not go on the inside of the computer. It stays on the out side of your computer. One bad thing about an external drive is that it takes up a card slot ih the back of your computer. The card slot can be used for something else. You can put a sound card in or a video card in back of there. CD:ROM drives primarily come in white. There are also grey , tan , black , and I have even seen an emerald one. CD:ROM drives also come in different speeds. The first one to come out was a single speed CD:ROM drive , which is the slowest speed of them all.The second one to come out was a double speed drive. the double speed is faster than the single speed , but is still very slow. After that came the quad speed CD:ROM drive. This drive is faster than the double and the single drives but still is not that quick. Then came the six speed drive that was pretty fast. The most common drive in most households today is the six speed CD:ROM drive. The fastest CD:ROM drive on the market today is the eight speed drive. This is starting to be installed on the newest computers being sold. The ten speed CD:ROM drive is still not on the market for sale but it is being made as we speek. Itis supposed to be on sale to the consumer in about two years. This report is is about CD:ROMs and CD:ROM drives how they work. I talked about speeds , styles , hooking them up , I compared them to compact disk players. BIBLIOGRAPHY Grolier Multimedia encyclopedia Version 7.04 1995 Copyright 1995 "PC MAGAZINE" October 1991 Author:doesn't say Copyright 1991
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