xps 13 2015 SD Card reader only works with 1 adaptor
I had my SD card reader replaced last December because it wouldn't work and wasn't recognised by the computer. I thought it was working, but I recently got a new SD card (micro) with an adaptor. The computer won't recognize the card when I use the new adaptor. If I use my old PNY adaptor it works fine. I have tried several adaptors now, and only the PNY adaptor works. All of the adaptors work fine in my son's xps 13 computer.
Can someone tell me why some perfectly good adaptors work and others don't?