Following guide will teach you how to format your USB STICK.
fdisk -l /
fdisk -s to determine usb drive path.
fdisk /dev/sdaX to enter fdisk program with device attached
d to delete existing partitions.
n to create new partition
p for primary partition
Hit enter until you get to "Last Sector ...", you will be prompted to enter size of usb drive partition. Here you can leave it blank or give it a size, total size of your usb drive.
t and select appropriate partition type
finally hit w and the changes you made earlier will be written to the disk and fdisk program will quit.