These instructions are for someone who needs to format a USB drive or HDD using their Linux machine:
First, install GParted:
Open a Terminal
$ sudo apt-get install gparted
Once gparted is installed, you should be able to open Gparted by entering:
$ sudo gparted
In the upper right-hand corner, you should select the device that you want to reformat. ALWAYS VERIFY THAT YOU ARE DEALING WITH THE CORRECT DEVICE.