SD card suddenly not read by my phone

[Android Central Question]

I got a 32 GB SD card for my Samsung galaxy J7 a few weeks ago. It was working fine but suddenly I don't see my stuff on the phone. I have saved music and pics all on the card because the phone doesn't have a lot of storage. It keep asking me to mount my SD card which is already in. I tried removing the card, my SIM card and the battery but it still not showing the card. I tried to load an old SD card and it read the card. Unfortunately, this card had my previous data which I have erased after transferring them into the new card which is not working now. Please kindly help me out. Thanks so much!

 

[Thacy]

It seems the problem is with the new SD card. Did you try the new card on another mobile phone or computer?