write about optical disc
Answers
Answer:
An optical disc is an electronic data storage medium that can be written to and read from using a low-powered laser beam. Originally developed in the late 1960s, the first optical disc, created by James T. Russell, stored data as micron-wide dots of light and dark.
Explanation:
Answer:
An optical disc is an electronic data storage medium that can be written to and read from using a low-powered laser beam.
Originally developed in the late 1960s, the first optical disc, created by James T. Russell, stored data as micron-wide dots of light and dark. Russell's optical storage system used a powerful backlight to read the dots through a transparent sheet of material on which the dots were encoded.
In later optical disc systems, a laser read the dots and the data was converted to an electrical signal. Then the data was converted to audio or visual output. However, the technology didn't appear in the marketplace until Philips and Sony came out with the compact disc (CD) in 1982. Since then, there has been a constant succession of optical disc formats, first in CD formats and followed by a number of digital versatile disc (DVD) formats.