While the 20X advertising sounds good, all things need to be just right to get it. You need to have NO other activity going on while you burn for one thing. No web surfing or any game playing. Some will say that anti-virus or other memory resident programs can interfere with the burn process also. If you are real concerned with the burn speed, the only way to see if that is the case is to shut down other programs that may want any resouces. Then try again.
i recently got a Philips SPD3600CC 20x external usb dvd burner. I enabled nero to show the ACTUAL burn speed instead of the selected burn speed. the burner will get to 9.5x then it will start slowing down and stay at 7.9x. I am using tdk 16x dvd-r media. It takes about 7 minutes for the dvd to burn. Is it just me or is this product defective? Any input appreciated.