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Identify CDROM Drive Components
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The CDROM, or Compact
Disk Read Only Memory drive is a device that reads,writes and can decode
data stored on a cdrom disc. Data is stored on this disc in the form of
tiny pits in aluminum film. The data is organized on tracks on the cdrom
in about 682 MBs. The CDROM uses a controller to "talk" to the PC. The Interface is the actual connection from the drive to the expansion slot. CDROM drives are available in the SCSI, the IDE and Parallel-Port interfaces.
Inside The CDROM Drive The Laser Diode emits a low-level beam toward the reflection mirror. A servo motor is activated by a microprocessor onto the tracks on the disc. This is done by moving the reflecting mirror. When the beam hits the disc,refracted lights is then focused through the first lens under the disc. It is then bounced off the mirror,and directed to the beam splitter.
The beam splitter sends returning laser light to the next focusing lens. And the last lens sends the beam to a photodetector, which converts the light into electric pulses. The microprocessor then decode these electric pulses and send them to the computer through the data cable and the controller.
Components Outside The CDROM Drive When you look inside your computer you will notice that the CDROM Drive is mounted at the top in all tower units and may be mounted in an assembly at the front of the Desktop PC. As with the Hard and the Floppy Drives,the CDROM Drive processes data with the help of the Controller which may be mounted in an expansion slot but in most cases it will be mounted directly unto the motherboard. The drive and controller are connected by the Ribbon Cable which allows the data to flow back and forth as needed. At the rear of the CDROM Drive you will see a Jumper which is used to assigned the drive as the Master drive or the Slave drive. Since the CDROM is can be used to play music on compact disks, the Sound Card is connected at the rear of the cdrom drive. At the other end of this connection you will see the Power Supply connector. Take the time to remove the cover of your PC and get to know each and every component. Study the location of your CDROM drive and how its mounted in the System Unit. By doing so you will become more confident about understanding your computer system.
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