PRE-RECORDED MEDIA - CD / DVD REPLICATION

INTRODUCTION:

DVD manages to store at least seven times more data than a standard 650MB CD by reducing the size of the recorded pits (using a higher frequency laser source) and packing the tracks closer together. The double-side version (DVD-10) doubles the storage capacity and a dual-layer disc (DVD-9) raises it to around 9 GB. The single-side disc consists of a 0.6mm recorded half, bonded to a 0.6mm blank half; double side disc have two recorded sides back-to back.

Priority in DVD development was given to DVD-Video with its potential for high quality pictures, surround sound, widescreen and interactivity, with considerable amounts of data compression to accommodate full-lenth movies (133 minutes) on a single-sides disc and then DVD-ROM for computer applications. However, a strong lobby led by the Acoustic Renaissance for Audio and others, pressed for a no-limits DVD-Audio option having up to eight channels for surround sound, and a choice between sampling frequencies of 44.1, 48, 88.2, 96, 176.4 or 192kHz, 16,20, or 24 bit resolution.