Extraído desta discussão de perguntas e respostas no site específico do Apple Stack Exchange: Como faço para ejetar ou desconectar com segurança um iPad, iPhone ou iPod quando o iTunes não está em execução?
In the Finder in Mac OS X, press Command+Shift+G to Go to folder. Type
/Volumes
. This will take you to the “Volumes” folder. If your iDevice is mounted as a drive, it will appear here. You can select it and press Command+E to eject it. If it does not appear here, it is not mounted as a drive, and you can simply unplug it. Note that it may or may not appear on your Desktop or in a Finder sidebar depending on your settings, but it should always appear in the/Volumes
folder.