First of all, you have to connect your SD card to your system, so that you will know that what is the problem with your card, sometimes your card can be fixed by putting it in the system, you can put your card in the system. Can connect via card reader
You can fix your SD card via Command Prompt
For this you must first
You have to connect your corrupt SD card to your system through card reader so that your system can detect your card.
Then you have to go to MY COMPUTER/THIS PC
After this, locate the SD card by going to Devices and Drives and write down the drive letter with you
Now run the command prompt and type chkdsk h: /r where h is your drive letter
This command will completely scan your corrupt card and if there is any problem it will fix it, after which your card will start working perfectly again and you can store any of your data in it