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Optical Disk Drive

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  • Is a disk drive which uses optical-disc technology to read and write discs.
  • Connected to motherboard via IDE (ATA), SCSI, S-ATA, Firewire, or USB interface.
  • Burning speed rate is 1x ,4x, 8x, 12x, 24x, 48x, 52x.

Types

CD-ROM

  • Stands for Compact Disc Read Only Memory.
  • Users can read data from the CD but cannot burn/write their information on CD.

CD Writer.

  • Users can read and write data to and from the CD.

DVD-ROM

  • Users can only read data from the CD and DVD.

DVD Writer

  • Users can read and write data from both CD and DVD.

Working

  • Consists of three motors.
  • First to inject and eject the tray, second for spinning the CD and third to move the laser beam back and forth.
  • Uses Optical-disk technology where a laser beam alters the surface of a plastic or metallic disk to represent data.
  • Unlike to hard disk, which uses magnetic charges to represent 0 and 1, optical disks uses reflected light.
  • On disc surface (CD or DVD) 1's and 0's are represented by flat areas called lands and bumpy areas called pits.
  • To read a disc, a laser of tiny beam of light is emitted on the surface area.
  • This surface area reflects the light, and amount of reflected light determines whether the area represents a 0 or a 1.
  • To write on the disc a tiny laser of beam of light is emitted to heat the layer made-up of organic dye or metallic alloys to form pits. And these alternating lands and pits form the data.
  • For CD-R it is heated upto approximate 200°C and for CD-RW approximate 700°C.
  • As read and write operation does not touches the surface of the disc, there is no friction and no wear or risk of disc crashing.

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Tip Box

Remove CD or DVD stuck in the disk drive

You have to insert a pin in the hole, which is beside the switch button at front side of the drive.

It is helpful, when power is cut off.


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