Verbatim DVDR/RW uses MKM/ Verbatims technology which ensures any recording to be of a superior quality. Mitsubishi Chemicals R&D combined with its strong coorperation with drive manufacturers ensures the broad compatibility of Verbatims discs making them ideal for sharing computer data, home videos, photos & music. From Europes 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.DVD+R is a recordable disc providing 4.7GB capacity. Compliant with the +RW-Alliance specifications.AZO recording layer. Highest Level of recording stability. Superior Archival life. This is a disc with a matt silver surface. It can be written on with a CD/DVD marker pen.