DualDisc

DualDisc is a type of double-sided optical disc developed by EMI Music, Universal Music Group, Sony/BMG Music Entertainment, Warner Music Group, and 5.1 Entertainment Group. 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.
DualDiscs first appeared in the United States in March, 2004 as part of a marketing test conducted by the same five record companies who developed the technology. The test involved thirteen titles being released to a limited number of retailers in the Boston, Massachusetts, and Seattle, Washington, markets. The test marketing was seen as a success after 82% of respondents to a survey (which was included with the test titles) said that DualDiscs met or exceeded their expectations. In addition, 90% of respondents said that they would recommend DualDisc to a friend .
DualDisc titles received a mass rollout to retailers throughout the United States in February, 2005, though some titles were available as early as November, 2004. The recording industry expects to have 200 DualDisc titles available by the end of 2005 and over 2,000,000 units have been sold to date.
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