LSK Media DVD+R DL Double Layer 8X 8.5GB 240min Video – Logo Top, 50 Pack in Spindle | Blank DVDs for Burning Video | DVD Discs Blank | Recordable DVDs: Amazon.co.uk: Computers
DVD-R DL - Wikipedia
Amazon.com: DVD+R DL Double Layer Logo 8X 8.5GB 240min Video – LSK Media Logo Top, 100 Discs, 2-Pack, 50 Pack in Spindle | Blank DVDs for Burning Video | DVD Discs Blank
DVDs - digital versatile disks - how they're made and how they work