A primary design goal for WDF was to make the driver models easy to extend to support new types of hardware. The first hardware-specific specialized I/O targets in both UMDF and KMDF support USB devices. You can use the USB I/O targets to write a fully functional Windows driver for a USB device that uses the Windows USB device stack. -A primary design goal for WDF was to make the driver models easy to extend to support new types of hardware. The first hardware-specific specialized I/O targets in both UMDF and KMDF support USB devices. You can use the USB I/O targets to write a fully functional Windows driver for a USB device that uses the Windows USB device stack.