Instruct: Classify a given review into positive or negative sentiment.
Query: Bad discs

I have season 1 & 2 of Route 66 and they are fine. Unfortunately season 3 seems to have a problem. Discs 1, 2 and 4 make a terrible pounding sound and won't play. I've tried this on 2 different DVD players and no luck. I ordered season 3 twice and both were bad. Not sure why some reviewers received good discs.