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 ...
Compatible and versatile * Burn to all major formats: DVD±R/±RW, DVD-RAM ... in the HP dvd840i/e. * Burn discs at high speeds. * Record to single- or double-layer DVDs, and now to DVD-RAM.