There is only one device that shows a serial number.
There is only one device that shows a serial number.
I have a mouse and a keyboard plugged into my laptop. But only the keyboard shows up with one number in the list, while other USB devices show up as having several drives attached. I think this means the system sees the connection, but it doesn't use the actual device right now? Wait, turns out that item is not from my keyboard at all—it's a webcam or some other gadget that isn't plugged into a USB port.
usb serial number is something just for windows... unless you mean a hard usb drive, then it will be all random numbers or nothing. It depends on the computer to add some info (if needed), but drives have their own serial number stored inside them. So Windows just reads that to give it a letter when you plug in it. That whole thing with multiple things connected by one receiver is super common too. Think of a usb receiver plugged into many things like flash drives, which might hold drivers or even apps that download stuff or control RGB lights through i2c. Basically, that means the single usb device has inside several different parts that can work together at the same time.
usb serial number is something only windows knows... unless you are using a real USB stick, the code will just be random letters or nothing. The computer only saves this info on actual flash drives to give them a letter name like C: or D:. That special thing called an "USB composite" is really common... it means one little plug can connect many devices at once. For example, you could have a big USB box that holds both a regular hard drive and a small storage stick inside it. If that stick has some extra programs on it, they run in the background while your main drive works too. Basically, the whole kit is designed to work together without needing separate plugs.