Not sure about TouchWiz or other varients of Android but on Sense you have two options...
1) Erase Phone Storage (which clearly explains that it is music, pictures, etc)
2) Factory Reset (erase phone data)
Seems pretty straight forward to me.
1) Erase Phone Storage (which clearly explains that it is music, pictures, etc)
2) Factory Reset (erase phone data)
Seems pretty straight forward to me.