iTunes music data
I just reinstalled iTunes. All of my music is still there (as far as I can tell), but I'm wondering about the data (e.g. playlists, ratings, etc.) that is not appearing yet. When I sync my device, will that data repopulate iTunes from the device, or will it be erased from the device because it's not on iTunes?
I mean, I rate songs and make playlists from the device that are then transferred to iTunes when I sync, but it would be a lot to recreate from memory if I'm wrong, so I wanted to double-check.