Optical drives

LG 20x SUPER MULTI DVD-REWRITER with SecureDisc (Lightscribe) : RETAIL BLACK

R360

LITEON® DVD Multi-Writer SATA, 20x+R/-R, 8x +R/-R DL, 8x +RW, 6x -RW, 12x -RAM, 16x DVD, 48xCDR, 24x RW, White & Black

R330

External LG 20x SUPER MULTI DVD-REWRITER with SecureDisc (Lightscribe) : RETAIL BLACK

R725

Optical drives

CD and DVD discs use cyanine & phthalocyanine dyesare photosensitive organic compounds for the coating dye. It is a compound similar to that used in making photographs. When a CD-R is recorded the dye is heated by the writing laser and becomes opaque (or absorbtive) through a chemical reaction to the heat.

A 16x DVD-RW writes data at 21.13 MB/s, roughly 9 times that of a CD-ROM. DVD physical spin rate is about 3 times faster than CD.

HT: CD info centre

Also see DVD FAQ