Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Doesn't work properly

The reader did not read the card; instead it kept prompting me to format the card which would have destroyed the data. I bought a Sandisk MicroMate SD / SDHC Memory Card Reader that works perfectly. It read the same card without prompting me to reformat. It cost about $6,but the Sandisk reader works, this one doesn't.