DUALDISC

DualDisc is a type of double-sided optical disc product developed by a group of record companies including EMI Music, Universal Music Group, Sony/BMG Music Entertainment, Warner Music Group, and 5.1 Entertainment Group [1] and now under the aegis of the Recording Industry Association of America (RIAA). It features an audio layer similar to a CD (but not following the Red Book CD Specifications) on one side and a standard DVD layer on the other. In this respect it is similar to, but distinct from, the DVD Plus invented in Europe by Dieter Dierks and covered by European patents.