I recently purchased a brand new Mad Dog external Dual Layer USB 2.0 8X dvd burner which supports not only dvd+r, dvd-R, CD-r, but also dual layer. However when I insert a blank phillips dvd-r, it will not read it. It does however read every other media I insert into it, such as cd's, and cd-r's. I think it might be a media problem because I had the same issue with the Phillip's dvd-r's in my old burner drive. I tried updating the firmware to every compatible option, yet it still would not work. When I click on it in My Computer it says please insert a blank disc. I desperately need help, so any comments are appreciated.