Dvd ram is a rewritable media that uses phase change technology for recording two generations of dvd ram are available 26gb52gb and 47gb94gb dvd ram is designed for data intensive high performance applications data stored on dvd ram can be accessed in the same manner as a hard drive with drag and drop capabilities and can be overwritten 100 000 times double sided discs are available either in a type 1 non removable cartridge 52gb capacity or type 4 removable cartridge 94g