Step 1: Plug a USB drive with at least 16 GB of storage space into the USB port on your Mac.
To build a bootable Windows 10 ISO from your Mac's Terminal, follow these steps: Mac Terminal (OS) is the macOS operating system's command line interface (CLI). Use Terminal to Build a Windows 10 Bootable USB 05 Make Windows Bootable USB Mac with PassFab 4WinKey Method 1.