ICT Hardware

ICT Hardware


Optical Media refers to data storage media, such as a Compact Disc (CD), Digital Versatille Disc (DVD) and Blue Ray Disc which are read by a laser beam.   There are various types of CD and DVDs –

  • Compact Disc – Recordable (CD-R)
  • Compact Disc – Rewritable (CD-RW)
  • Digital Versatile Disc – Recordable (DVD -R)
  • Digital Versatile Disc – Rewritable (DVD-RW)

Advantage & Disadvantage of Optical Media

The data stored in these formats can be accessed  with the help of a CD/DVD – Read Only Memory (ROM) drive. Compared to a hard disk, optical media is less likely to loose its data and has a longer shelf life – about seven times longer than magnetic media. It is also ideal for taking backups and transferring data between different computers. But optical media has less seek time (the time taken to access information from a disc) compared to a Hard Disk.

Key Terms of of CD/DVD ROM Drive

  • Interface: Refers to a connector, which connects a CD/DVD-ROM drive to a computer. A CD/DVD ROM drive connects to a computer by using the Integrated Drive Electronics or SATA interface.
IDE Connector SATA Connector
  • Storage Capacity:  Refers to the amount of data that you can write on a CD/DVD
  • Buffer: Refers to the memory of a CD/DVD-ROM Drive, which is used to hold data temporarily. In other words, the size of the buffer is the amount of memory space that is used to store data, which is to be written on a CD/DVD.
  • Format: Refers to the specification that defines the type of CD/DVD accepted by a CD/DVD-ROM
  • Speed: Refers to the rate at which a CD/DVD rotates in a CD/DVD-ROM Drive.