Please contact Media Sciences if your questions are not answered on these pages. How to Contact Media Sciences Return to the FAQ Index Long lists of CD quality indicators do not really interest me. Interchange and longevity are the dual requirements of CD quality. Each disc must always work first time, every time, in any drive, even after extended periods of storage. In other words, quality means giving customers what they really want.
Standards contain many quality indicators that support a happy customer.
Quality indicators can be classified as mechanical, format, data, and servo. Since the mechanical and format requirements are straightforward, data and servo related issues remain. High disc quality enables the drive to rapidly acquire and maintain stable servo lock for focus, radial position, linear track velocity, and data clock. Servo performance can be compromised by defects that obscure or distort the laser beam. Defects not only result in data errors but also in loss of the important servo signals.