• Optical storage is an electronic storage medium
    It uses low-power laser beams to record
    and retrieve digital (binary) data.
  • Optical Devices: CD, DVD, and Blu-ray.
    Blu-ray uses blu-lasers to hold-up to 25 GB of data.
  • The basic operation: READ
    Every optical disc is able to be read.
  • The disc can be only written one time which cannot be erased.
    It is cheaper.
  • If the disc can be erased, it is able to be used multiple times.
  • ROM: Read Only Memory
  • RAM: Random Access Memory