This is from my personal experience and it seems to be sd card specific.After you did the steps mentioned by "doreenjoy" ...
Always click "no" or "Cancel". if windows complain saying the "SD card" is bad and need to be scan (or what ever it think it need to do to the card".
I have 2 SD cards which works fine on 505 b4 but now refuse to read after it go through the Windows scan.
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