its not your burner thats not letting you burn faster than 4x, its your settings on the computer...the data transfer speed on your computer to the data transfer speed on your burner are at the recommended level to burn with no skips....when you have a dvd to burn, the computer has a speed limit to transfer the file. at that same second the burner has to burn the files to the dvd at the speed of the tranfer...once the burner starts to burn faster than what the computer feeds it you tend to have errors and failures on your burn.