I have the Memorex 16x dvd burner. Everything worked fine for about a month. After trying to copy bad santa, for some reason things went downhill. I tried using toothpaste on the dvd because it was damaged. Now when I burn dvd's it takes over an hour to encode, as opposed to 25 minutes before. It also takes a considerable amount of time and sometimes several tries to write the dvd to the disc. Also my computer seems to be running slow while I burn. I use dvd shrink and nero to write. This is driving me nuts. Primary and secondary are both DMA. PLEASE HELP.