Toshiba, in collaboration with disk manufacturer Memory Tech Japan, has
successfully combined a HD-DVD and DVD to a single 3-layer, twin-format
disk. The resulting disk conforms to DVD standards so it can be played on DVD
players, and also on HD-DVD players after upgrading the firmware. The disk can
have either Single Layer DVD (4.7GB) + Dual Layer HD DVD (30GB); or Dual Layer
DVD (8.5GB) + Single Layer HD DVD (15GB). There will not be a long wait as the
new disk can be produced on the existing HD-DVD mass production line with minor
process additions.