摘要:
An external device includes a controller, a connector, a function circuit, and a storage device. The storage device stores firmware and an image file. The image file includes an installation program and a driver. The external device is coupled to a host via the connector. The firmware can drive the controller to generate a virtual optical disc drive in the host and load the image file to the virtual optical disc drive so as to start the installation program. When the host does not have the driver, the installation program can install the driver in the host. When the host has the driver, the host can drive the function circuit to work.