If you have usb storage (flash disk, sdcard, mmc, or another media) and want to format it. The easy way is using gparted.
1. Plug in your usb storage media (flash disk, sdcard, mmc, or other media).
2. Run gparted.
3. Choose the usb media (
5. Right click again on the media then choose "format to". Choose the preferred file system type.
6. If it's ok, then choose apply.
7. That's it your usb storage media is formated.. :)