I have a 64gb micro sd which was working fine. I was able to use file transfer, move files, ect. I tried to use the adapter and I got the error that it couldn't read the sd card. I was trying to reformat the sd so I can use it correclty with twrp, but because I can't get the computer to see it..here's my issue. I did load it back onto my sg3 and now it seems extremely slow in reaching files there.

Is there anything I can do to reformat if or am I going to have to just chalk it up and order another one