When editing and formatting a USB drive a lot, make sure you have added a drive letter to it.
If the USB doesn't show up in Windows Explorer, this is usually the case.
I've attached a picture of one of my working USB drives. Notice the assigned drive letter (E:)!
To assign and check what drives are taken, I prefer to use Disk Management.
You find this tool under Control Panel -> System and Security -> Administrative Tools -> Computer Management.
In the side menu, go all the way down to Disk Management.
Right click the disk you want to assign a letter to, and choose "Edit drive letter and paths".
From this menu, you can select what letter it should use.