I literally tried about a millionth time that to format my card. When I got to Menu > USB Stick Format, it says that the format is confirmed, but when the local file browser is opened all files remain the same. What should I do?
EDIT: Question has been resolved.
Install gparted (it is in the repository) . Put your card in the machine and start gparted. It will ask your password. THen you can see, unmount,format etc.
You can use "Disks" for it , select your sd card and you can find gear icon at top of the window , select format device/card , it takes some time and after that select the sdcard and again select the gear icon and select create partition , here you go...
