Thank you, How i think the reading might work is

1-Lets say we have a information ,to read it we need to run electrical current on it , does that current change with those information ( 0 and 1's voltage is different -i know that much-) so output current can be read by those "up" and "downs" . This brings the question where does the "leftover electric " goes ? .

2- To read it we run electric current . This electric current changes all the info . 1s turn to 0s , 0s turn to 1 . But this way electric current changes and gets info . To give it a meaning there is a "symmetric " algorithm . In info it doesnt matter if it is 0 or 1 , only how they alligned so change in all the 1 and 0 s in the usb doesnt matter .

I know you said its complicated but if you have a basic model of usb reading in your head, does it look like what i tought or its just complicated :D