To and extent, if its set to auto-update(takes all songs you have checked or in library depending on settings yet again)) it will ask to reformat the ipod before you use it. If you have to set to manual mode(where you drag and drop songs) you can keep adding to it.
FBA, your not going to find a “Previous list” of ipods plugged in. Unless there is something in the registry I have never seen, your only going to get the last one. Also, its on the box if you didn’t toss it. Other then that your fucked. Dont bother calling apple bc if you dont have the serial they wont do shit anyways. They put in a case, tell you thats the best we can do. Trust me, used to work there :hsdance: