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Wow, I actually get a whole bunch of new devices...
crw-rw---- 1 root dialout 166, 0 Feb 3 17:25 ttyACM0 crw-rw----+ 1 root audio 14, 41 Feb 3 17:25 dmmidi2 crw-rw----+ 1 root audio 14, 34 Feb 3 17:25 midi2 crw------- 1 root root 240, 6 Feb 3 17:25 hidraw6 drwxr-xr-x 4 root root 80 Feb 3 17:25 serial drwxr-xr-x 2 root root 60 Feb 3 17:25 bsg crw-rw---- 1 root disk 21, 0 Feb 3 17:25 sg0 brw-rw---- 1 root disk 8, 0 Feb 3 17:25 sda brw-rw---- 1 root disk 8, 1 Feb 3 17:25 sda1
cyclotron3k
Did a little bit of googling and I'm not claiming this to be definite but I think the one device is opening up two communication channels with the PC over the 1 USB connection. 1 of those comms channels is just having fairly simple generic USB HID messages sent over it and the pc is accepting these and saying "okay there's a mouse there" and on the other comms channels it's sent whatever it needs to to say "this is a generic storage device, you can mount this and use it".
If you run "ls /dev" without it plugged in, then again with it plugged in, how many more devices does it show? Out of interest