B. Diddy

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Welcome to Android Central! First, make sure it's well-seated in the SD card slot. In most devices, the SD card needs to be pushed in until it clicks into place, but in others, you just have to make sure it's pushed in all the way.

If that doesn't help, then remove the SD card and insert it into your computer's reader. Can the computer access it? If so, backup any data on the SD card, the reformat it, and then try it again in your phone.
 

B. Diddy

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Have you tried inserting the SD card into your tablet (if it has a slot), to see if the tablet can read it?

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