Just because dvd's worked for you in the past, doesn't necessarily mean that they are the same quality today. Most dvd batches vary quite a bit from batch to batch. Memorex 16x media could be any one of 5 different media codes (manufactured at different plants at different quality levels). Unless you want to spend a lot of time searching and learning media codes, and identifying the different medias, and which ones work well in your burner, I would opt to just buy some good Verbatim or Taiyo Yuden media. Everyone is always trying to save two or three dollars on a 50 pack of dvd's. By the time you figure in all of your coasters, you would have been far ahead to just buy the good stuff. Before upgrading your firmware, try some Verbatim dvd's and see how they work. Most of the time, you can do a firmware upgrade with no problems, but once in awhile, you toast your burner.