I use them to connect MIDI instruments to FL Studio and Maschine. One day a few months ago it just stopped working. It didn't even read small USB sticks. But I fixed it just like that. 1. Restart your computer2. When you return to Windows, disconnect the USB cable from the back of the card reader3. Reconnect the USB cable to the card reader4. Everything should work like new! I was about to buy a new USB hub so I thought try the old "unplug and plug back in" and it worked!