i just recently purchased this Optiarc AD-7190A DVD-RW Burner and it read and burns at an extremely slow rate. probably at 1X. i know about the DMA and i have played with that but i can't change one of the controller to change from PIO without doing a force using a dell utility. anyway, that shouldn't cause it to run this slow, like i said 1X or so. and while it's burning or even just reading, it lags up the computer extremely. any help in troubleshooting this is appreciated.