R4i schd

Well my 8gb memeory card have been acting up and i need some help im trying to update my firmare for my R4 but when i try to delte some games and my old firmware i get something called Read only and you cannot delete this file. Im wondering what should i do if i cant delte any files how can i just delte everything and start over?

reformat the sd cardhttp://www.sdcard.org/consumers/formatter_3/eula/thats a good program to use and will take everything off and give you a fresh start

I love you =)