chapter  96

Magnetic and Optical Recording

WithYufeng Li

The heart of recording technology is for the process of information storage and retrieval. In addition to its obvious importance in different branches of science and engineering, it has become indispensable to our daily life. When we make a bank transaction, reserve an airplane ticket, use a credit card, watch a movie from a video tape, or listen to music from a CD, we are using the technology of recording. The general requirements for recording are information integrity, fast access, and low cost. Among the different techniques, the most popularly used ones are magnetic and optical recording.