![]() Is still using the vid of the master manufacturer or writing vid and PID to the product. The two vids should be different (except for the devices produced by the master manufacturer ).īecause the duplicate vid and PID does not seriously affect the use of the product, many USB equipment manufacturers (most of the factory in shanzhai) do not apply for their own vid from the USB forum for convenience. Therefore, in theory, the vid of a USB storage device should be the vid of the device manufacturer, rather than the vid of the master manufacturer. When a USB device connects to the host, if the firmware contains the vid and PID of the device manufacturer, the vid and PID are reported to the host, the vid and PID of the master control manufacturer are ignored. Vid and PID are usually stored in two modes: vid and PID of the master control manufacturer, which are stored in the bootcode of the master control, and vid and PID of the equipment manufacturer, the vid and PID are stored in a non-volatile storage device (EEPROM The supplier ID (VID) is applied by the supplier to the USB for a forum, the vid of each supplier is unique, and the PID is determined by the supplier. The host uses different vid and PID to distinguish different devices. According to the regulations, all USB devices have Supplier ID (Vid
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