Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Unusable!

I had used TDK DVD-R blanks many times before so I ordered this without hesitation. To my complete shock, these DVD-R discs, made by Ritek of Taiwan for TDK, were completely unusable in various DVD burners: Matsushita, NEC, Toshiba, Sony, etc. I tried over a dozen blanks in these burners, using different DVD burning programs on different computers (and a set-top burner), and not a single disc was usable.Avoid this TDK 100-pack like a plague.I bought a 60-pack Playo DVD-R spindle at Staples and every one of the 10 or so discs I've burned had absolutely no problems.