Dual format High def disc from Warner

• Warner Home Video introduced Total High-Def disc, a disc that will put an HD DVD-formatted movie on one side and a Blu-ray version on the other.
• Both formats use blue-laser diode technology to deliver greater capacity than standard-definition DVD, enabling the discs to store high-definition content.
• The disc includes the same specs offered by each format separately--for example, either a 25GB or 50GB Blu-ray movie on one side, and a 15GB or 30GB HD DVD movie on the other. The intention, according to Warner, is to keep the feature sets of both versions intact so that the viewer will get the same experience whether they watch the Blu-ray version or the HD DVD version.

Source : http://www.pcworld.com/