I have the Lite-On 1633SX external burner and for some reasons my dvd burning time is incredibly slow, it takes around 2 hours to burn a dvd and I know that can't be right. Nero tells me that it is burning at 16x yet still takes 2 hours, i am using Memorex 16x dvd+r's. I have gone in and checked to see if the ide's are set to DMA which they are, even tried reinstalling them to see if that would help but to no avail. Does anyone have any suggestions that i could try? I am using this burner on a sony vaio laptop, PCG-V505ACP. THanks.