I'm thinking about updating to iOS 6. Will my songs, videos, photos, apps be intact? Or will the upgrade wipe it all out and force me to reinstall everything again? I have like 40 Gigs of stuff on my phone - I REALLY don't want to reinstall 40 Gigs of stuff - ESPECIALLY from iTunes and it's slow & clumsy interface. (Not to mention iTunes likes to delete my Playlists whenever I plug my iPhone into it for some reason...? But that's a whole other issue...) Just curious. Thanks.