sd card blank or unsupported file system, but cant add anything to card ,no space?

[mysteriousthingz]

Sd card was fine. But got a notice that card was blank or had
Unsupported file system. How do I change this, get this back to where I can mice things to my Sd card.

 

[Mr. Lucky]

SD cards have a limited lifespan, particularly if you ever connected it to a computer and performed a defrag. Try reformatting it and see if it can be read again. You can do it from the phone (Settings > Storage) or on a computer. If you do it on a computer, format it as fat32. I hope you have a backup, because a successful reformat will wipe all data on the card. GL!