TOKYO Seeking to ease the transition from the DVD to HD DVD format, Memory-Tech Corp. and Toshiba Corp., the main promoters of HD DVD, have jointly developed a dual-layer ROM (read-only) disk capable of storing both DVD and HD DVD content in the same disk.
The new disk has the same structure as present single-sided, dual-layer DVD disks. Like conventional DVDs, two 0.6-mm disks, each with one recording layer, are bonded together with a roughly 40-micron-thick resin. The layer closest to the optical head has a 4.7-Gbyte capacity, meeting specifications for current DVDs. The other layer has a 15-Gbyte capacity to store HD DVD content.
The new disk would allow consumers to view DVD content until they purchase new HD DVD players.
The two companies claimed the new disk structure would expand content providers' options. Along with the DVD/HD DVD combination, the disk can store various content combinations like a full-length movie and a separate trailer.
The partners said they will soon propose the disk structure to the DVD Forum. Since it was derived from the present DVD dual-layer disk, development took only about six months, according to a Toshiba spokeswoman.
Memory-Tech said the new disk could be produced on its manufacturing lines at a cost that is comparable to current single-sided, dual-layer DVD-ROM or HD DVD-ROM disks.