why does my sd card not work it says unavailable

[AC Question]

It recently said SD card unavailable when trying to download all my other apps stopped working I tried factory resseting but didn't work

 

[billbell52]

I just solved a problem with mine. It is a new Samsung 64GB card. When I inserted it Android (Lollipop) formatted it and set it up. I had lots of problems getting data on it. I finally put it in my PC using an adapter and formatted it. I inserted it in my tablet and Android setup the folders. It appears that Android did not properly format it. I would recommend formatting it on a computer.

 

[Rukbat]

It should properly format on the phone. (Formatting it on the computer is what usually causes problems.) Check the card with SD Insight (it could be counterfeit), but be prepared to have to replace it soon (IOW, keep everything backed up on the computer).