Microsd Problem Have googled but got nowhere any help appreciated.

i have a class 10 sandisk microsd been working fine installed a few new files on my android device which then tried copying files onto the microsd which had no space i can now read the files on my card but i cannot delete any files or format it ive tried sdformatter 4 which ends with an error also tried chkdisk /r and diskpart clean all with no luck again i dont need the files just need the card to work again and suggestions appreciated