Essay on Optical and Audio Drives

Submitted By Wyplashwarrior
Words: 322
Pages: 2

By: Mike and Ross

Optical Drives

In computing, an optical disc drive (ODD) is a disk drive that uses laser light or electromagnetic waves within or near the visible light spectrum as part of the process of reading or writing data to or from opticl discs.
Some drives can only read from disks, but recent drives are commonly both readers and recorders, also called burners or writers.
Compact discs, DVDs, and Blu-Ray discs are common types of optical media which can be read and recorded by such drives.
Optical drive is the generic name; drives are usually described as "CD" "DVD", or
"Blu-ray", followed by "drive", "writer", etc.

Optical Drives Con’t

The first laser disc, demonstrated in 1972, was the Laservision 12-inch video disk.
The video signal was stored as an analog format like a video cassette.
The first digitally recorded optical disc was a 5-inch audio compact disc
(CD) in a read-only format created by Philips and Sony in 1975.
Five years later, the same two companies introduced a digital storage solution for computers using this same CD size called a CD-ROM.
Not until 1987 did Sony demonstrate the erasable and rewritable 5.25-inch optical drive.

Picture M8



Mass storage I/O multi-layered architecture
SDI is the infrastructure that brings all the drivers together. Drivers do not communicate directly, all interactions happen through SDI. By shielding a driver from direct knowledge of