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THE COMPACT DISC WHAT YOU REALLY NEED TO KNOW The Compact Disc is undoubtedly the most revolutionary medium of recent times. While the latest generation of optical media offer many extra benefits such as higher data density, faster access times etc. they are really just refinements of the basic CD technology. If you are new to CD technology, a good understanding of the basic principles of the Compact Disc is essential and provides a firm foundation to allow you understand derivative technologies as CD-R, Super-CD and Minidisc. In addition to an overview of CD technology we place particular emphasis on the standard CD tests and their implications in terms of disc playability across a broad spectrum of applications and hardware. A HISTORICAL PERSPECTIVE The development of the compact disc was due principally to a collaboration of two international companies, Philips and Sony. Philips had been working on an optical storage medium, which initially used analogue