Welcome to the Forum.
Explain exactly why you need to Burn your Media at 2x Speed.
There is nothing â€˜Wrongâ€™ with your DVD Burner. It should be noted that with a Modern DVD Burner using Modern DVD Media through the DVD Burner Firmware and/or DVD Media Code relationship in many instances is unable to Burn DVD-R Media slower than 4x speed.
A modern DVD Burner using known proven quality Modern DVD Media will in fact Burn data at or near the DVD Media rated speed better than Burning the same DVD Media at excessively slow 1x or 2x speeds. That is a well-documented proven fact. To visually document this fact suggest visiting the CDFreaks DVD Burner Forum (http://club.cdfreaks.com/f61/) and closely inspect the numerous Disc Quality Scans posted in that CDFreaks DVD Burner Forum which will visually document this fact.
Perhaps you should consider different DVD Media instead of your â€œSONY AccuCORE DVD-R discsâ€. Suggest using known proven quality error free Media such as Taiyo Yuden or Verbatim Media which have an excellent proven track record of consistently producing quality error free results. When using known proven quality error free Media such as Taiyo Yuden or Verbatim Media you will be able to produce quality error free results burning this Media at the DVD Media rated speed or slightly slower and will not need to attempt at Burn this Media at excessively slow 1x or 2x speeds to obtain consistent quality error free results.