Setp 1: On terminal
diskutil list
identifying usb drive in terminal

The name of the USB drive should be something like /dev/disk0, ./dev/disk1, /dev/disk2.

Step 2: Identify your disk name and unmount it with the following command:

diskutil unmountDisk /dev/disk2

Step 3: Next, type in and enter the following command that will start to burn your ISO to USB:

sudo dd if=/path/to/win-iso-file of=/dev/disk2 bs=1m

Step 4: You may need to wait 10-15 minutes to an hour to let Mac burn iOS to USB. Afterward, enter this command to eject your volume successfully:

diskutil eject /dev/disk2