679      iPhone_iPad_Mac_apple

External card reader not working

So I just bought a card reader last week for my MacBook Air. It worked two days and now it won't. I've looked under about this mac and it shows up as in the usb drive, it shows up in disk utility sometimes. However, it says it can't be mounted. I have tried everything!! Any help?

最后更新：2017-10-04 22:56:34

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