Initdisk is a straightforward USB drive formatting utility capable of reformatting any USB device and making it bootable again.
It is designed to be foolproof, making it an excellent choice for any user that needs to revive a dead USB device. InitDisk works via the elevated command line. You will be prompted to insert the target USB device and display the device data. From there, you are required to permit it to proceed. The USB device will receive a fresh FAT format, and you are good to go.
InitDisk formats with an MBR and FAT (12/16/32) partition for maximum compatibility. Its full drive size is 2.2 terabytes.
Rufus is a small Open Source utility that helps quickly format and creates bootable USB flash drives, such as USB keys/pen drives, memory sticks, etc. Rufus is now integrated with Fido to download Windows 10 and 8.1 ISOs from Microsoft servers. Video guide available.
WinToUSB will install and run the Windows operating system on a USB hard drive or USB flash drive, using an ISO image or CD/DVD drive as the installation source.