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Steve R & Alex M
CD-ROM(Compact Disc Read-Only Memory) drives are used to read CD-ROMS (A disc that contains information only readable to a computer), CD-ROMS are generally used to load software such as games or word processors, onto your computer. A CD-ROM drive can be connected to the computer using an IDE (ATA), SCSI, S-ATA, Firewire, or USB connecter. Almost all modern CD-ROM drives can also play audio CDs as well as DVD's and other data standards when used in sync with the right software.
The rate at which CD-ROM drives transfer data from CD-ROM discs is measured using a speed factor relative to music CD's. 1x or 1-speed which gives a data transfer rate of 150 kilobytes per second in the most common data format. When the disc in the center's speed is increased, the rate at which data is read is also increased. For instance, a CD-ROM drive that can read at 8x speed spins the disc at up to 4000 rpm (compared to the 500 rpm maximum for 1x speed), making it a transfer rate of 1.2 megabytes per second.
Above 12x speed, vibration and heat can become a problem for CD-ROM drives. CD-ROM drives above this speed use many different ways to overcome this problem. Constant angular velocity (CAV) drives spin the disc at a constant rate, leading to faster data transfer when reading from the outer parts of the disc, but slower towards the center of the disc. 20x was thought to be the maximum speed due to mechanical restrictions until Samsung Electronics created the SCR-3230, a 32x CD-ROM drive which uses a ball bearing system to balance the spinning disc in the drive to reduce vibration and noise.
To buy a CD-ROM drive: Head off to your local computer store such as a Comp USA or Best Buy. CD-ROM drives come in a wide price range, they can either be inexpensive or expensive depending on what you need. The more expensive CD Drives will be able to acomplish other tasks besides just reading CD-ROMS. These CD Drives can "burn" Cd's (Link Below) and read/burn DVD's also. If you don't want your CD Drive to do these things, you can get a less expensive one. Another factor in the price of a CD Drive is the speed at which it reads data. A CD drive which reads CD's at a rate of 32x for example, would be much more expensive than a CD drive that reads CD's at a rate of 16x speed.
Questions Asked During Presentation
- What's the Difference between a CD and a DVD?
-Although DVD and CD media and drives have the same form factor (media size and shape), that's the only simularity between the two in terms of data. DVD media has at least seven times the capacity of CD media — which is acomplished by using multiple recording layers and recording on both sides of the media. The write method also helps boost the capacity of DVD.
- What is some mid-history of CD-ROM's?
-In the 1990's, the second generation of the optical discs came out and could hold more information and tv quality audio. Thesse disc's included minidiscs, dvd's, GD-Rom, dmd, universal media discs, and more.
*What is a blu-ray format?
Blu-Ray is the next generation optical disc format which offers more than 5 times the storage capacity of normal CD-ROMs. While current optical disc technologies such as DVD, DVD±R, DVD±RW, and DVD-RAM use a red laser to read and write data, the new Blu-Ray uses a blue-violet laser instead, which is where the name Blu-ray comes from.
Links:
How to install a CD-Drive: http://www.fonerbooks.com/r_cd.htm
Troubleshooting: http://www.fonerbooks.com/ide_cd.htm
CD burning information: http://en.wikipedia.org/wiki/Cd_burning
Components of a CD-Drive: http://computer.howstuffworks.com/cd4.htm
A view of CD-ROM Drive Laser Configuration: http://en.wikipedia.org/wiki/Image:CD_laser_assembly1.jpg
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