Below is a clip from a pretty helpful article. It says that the S4 shows up as a disk drive when plugged into a computer. However mine does not show up with a Drive Letter - which I need so I can sync my calendar program. Any helpers out there? Samsung Galaxy S4 tips and tricks - Opinion - Trusted Reviews What is Kies? Do I need it? Kies is Samsung’s desktop sync software, the equivalent of iTunes. The neat part is that you can use it to wirelessly sync files over your home network. Should you use it? We don’t. The Samsung Galaxy S4’s internal storage shows up as a media disk drive when plugged into a computer, so it’s not necessary. And it’s not all that good either.