V(4) is the 4-digit vendor code that the USB committee assigns to the vendor.ĭ(4) is the 4-digit product code that the vendor assigns to the device. When a new USB device is plugged in, the system-supplied USB hub driver composes the following device ID by using information extracted from the device's device descriptor: The set of identifiers generated for USB devices depends on whether the device is a single-interface device or a multiple-interface device.
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