How to format a USB thumb / pen drive or an external USB hard drive.
Plug the USB drive into a free USB port on your computer or laptop.
Click the Windows Icon (4 squares) in the bottom left corner of your screen, you will see the start menu appear.
Click “File Explorer” to open up “This PC”.
When the “This PC” window opens, find the drive letter that represents your memory stick, right click it and choose “Format…”. It will likely be D:\ or E:\
When the box appears, you can leave everything as it is then click ‘start’ at the bottom of the window.
A warning box will pop up, simply click OK.