sync music
I'm trying to simply copy some music onto my iPhone - or "sync" it I guess. iTunes is telling me that my iPhone is syced with another iTunes library (no idea, I only have one).
If I want to sync it to "this" library, I have to first "erase the iPhone." Then: "Erasing and syncing replaces the contents of this iPhone with the contents of this iTunes library."
What does "erasing your iPhone" mean? That sounds all encompassing, like it will erase literally everything on the phone. Or does it mean just other music? Or does it mean anything associated with iTunes, such as photos and videos too?
Please help!
iPhone 4S