Blu-ray/ DVD Combo ROM Disc Technology, Enabling 33.5GB Storage Capacity
DVD Industry Insider Report - The Scoop on DVD-R9 / DVD+R9 | Audioholics
DVD Layers - How DVDs Work | HowStuffWorks
Why is this 1998 dvd slightly over the limit for dvd5? Dual layer dvds didn't exist till 2003. Is this an early (now useless)form of copy protection? : r/DataHoarder