To date I have bought three of these devices and they all read, write and transfer data without problems. I prefer the shorter cable as I use it with my 3D printer to convert from MicroSD to SD card. The SD card slot has a fully functional spring mechanism. The only downside to these cables is that they can be easily pulled out of the microSD slot. You must also be careful not to pinch, scratch, or kink the ribbon cable as it is very thin and not well protected.
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