Verbatim DVDR/RW uses MKM/Verbatim's technology which ensures any recording to be of a superior quality. Mitsubishi Chemical's R&;D combined with its strong coorperation with drive manufacturers ensures the broad compatibility of Verbatim's discs making them ideal for sharing computer data, home videos, photos and music. From Europe's Number 1* for recordable media Double / Dual Layer is a recordable disc providing 8.5GB capacity on a single side (2.6GB for 8cm discs). Compliant with the +RW Alliance (Double Layer) or DVD-Forum (Dual Layer) specifications. The double / dual layer of recording has been made possible by the creation of a new substrate layer that sits in between each recording layer. This allows the laser beam to record on both layers. Once the first layer has been recorded, the laser re-focused to record on the second layer. Source: www.verbatim.com