Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worthless coasters

I'm really disappointed with these Memorex DVD-Rs. The price was great, but they do not work at all with my NEC DVD burner. I tried multiple ones from different positions in the cakebox and nothing works. I'm using Sonic as the burning software and it just makes an attempt and then says it fails. I've tried burning through Windows and had the same results. I now have 50 worthless coasters sitting on my desk.I was not trying to burn any protected material. These are movies I took myself of our newborn son. Now I have to go try and buy another brand of media. I would return these to Amazon but the return shipping cost on my dime would cost more than I paid in the first place. Very unhappy.