If you want to reformat a flash drive and can do it from console, just need to follow some short instructions.
To do this we must put the following command in the console, we must do as root:
mkfs.vfat -I /dev/sdb1
(Where / dev/sdb1 partition to reformat)
If you’re on Ubuntu or derivative distributions can do this by adding the command “sudo”:
sudo mkfs.vfat -I /dev/sdb1