Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Terrible

I returned these DVDs to Memorex after burning a few and finding out that they just didn't work. I have a TDK burner and tried them on a friend's burner (Cendyne or something) with the same results. I had tried to use them to back up files, but after indicating a success, I couldn't copy the files back from the DVD. I always got a CRC Checksum error.My experience with Memorex is ruined. Will never buy anything from them again, no matter how good the deal.