Determine if ISO will fit on DVD+R? in Chat Posted July 17, 2018 · Edited July 17, 2018 by Sizzlechest Also, why not just load the ISO in ImgBurn? It should surely tell you if the ISO won't fit the DVD+R you have inserted into your drive. It should either deny it or ask if you want to overburn it, which would tell you it won't fit on the DVD+R at its current size without overburn. So, it's, at least, slightly larger than the DVD+R size. Because I am scripting a dvd robot handler and I want to check the iso so I can load the correct disc (DVD-R vs DVD+R DL) into the burner.