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The laptop has fewer interfaces nowadays, and we increasingly rely upon USB Hubs. When unplugging certain USB devices from USB Hubs, we need to click the right option in the menu. As we got lots of USB device names in the menu, it is common for us to misoperate.
The numbers in the desktop menu corresponds directly to the physical numeric interface of the hub. So you just need to press the number in the menu corresponding to the interface, then you can safely unplug certain USB.
China Academy of Art