Optical storage disk was developed from videodisc technology during the early 1980. These storage devices work on a principle similar to magnetic storage devices; however, they use light as a media to represent binary information. A very fine laser beam is projected on the reflecting surface to read data from the disk. By detecting the light intensity reflected from the surface, the information stored on the disk can be accessed. Optical disks have a greater memory capacity than most magnetic disks; the largest ones can store 1.5 gigabytes of information, which is equal to about 700,000 pages of printed material. Optical disks come in sizes ranging from 3.5 to 12 inches (30 cm). They are widely used as auxiliary memory when large memory capacity is required. Optical Disks can be found in these three forms:
Types of Optical Disk
a. Compact Disk
b. WORM (Write Once Read Many)
c. Read and Write Optical disk
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