you should take care of your Pd that it should be unmounted before you did the for mating.
use the following commands on terminal
mkfs.vfat /dev/sdb1
sdb1 is you node name(that can be check through ‘dmesg’ or ‘fdisk -l’)
you can also change the your pd name by using following command on terminal
mkfs.vfat -n ‘desired pd name’ /dev/sdb1
