Buy DVD+R Double Layer Matt Silver | Verbatim DVD Recordable & Rewritable Discs | Verbatim Online Shop
What are Different DVD Sizes: DVD-5, DVD-10, DVD-9 and DVD-18
John Linneman on Twitter: "So it turns out not everyone is aware of the different media types used on PS2! Here's a guide! Blue disk = CD Silver = DVD (single layer) Gold = DVD-9 (dual layer) https://t.co/VTK64UUdfR" / Twitter
DVD Layers - How DVDs Work | HowStuffWorks
Blu-ray movies debut dual-layer discs
DVD Industry Insider Report - The Scoop on DVD-R9 / DVD+R9 | Audioholics