My macbook pro 2011 will not read SD card?

It has all of my 3DS save files on it and I need to transfer them. It does not show up in finder, only in disk utility. I cannot run any type of first aid on it as it is greyed out and it says “The disk you inserted was not readable by this computer.”

I don’t know what to do. I really need these files so I cannot erase to reformat. I could careless about the card itself; I have another one, I just really need those hours upon hours of saved progress I have on the card :(

What do I do?