A rewritable optical disc. First used in drives by Panasonic in the late 1980s, the phase change technology was subsequently employed in all major optical drives, including CD-RW, DVD-RW ...
The dual-layer HD DVD-R disc is based on the same disc structure as current DVD discs, HD DVD-ROM discs (read-only), and HD DVD-RW discs (rewritable): back-to-back bonding of two 0.6 millimeter ...