If you deviate from the common icons for operations like save, your users are going to say your programs is hard to use. Even if you simplify everything so that you think it's perfectly intuitive and much better than what everyone else is doing, they'll say it's hard to use, just because it's not what they're used to and not what they expect. Remember, to your users, whatever Microsoft and the other big guys do is "correct," so if you're doing something different, you are, by default, wrong.
Besides, even if your user takes 5 or 10 seconds to figure out where the save button is, that's 5 to 10 seconds of easily avoidable frustration you could have saved them, and it's just one more barrier preventing them from being able to use your app. Obviously, they're not using your app to revel in the joy of clicking a chronologically relevant save icon. They simply want to avoid losing their work and get on with more important things in life.
Stick with the 3.5" disk; it's a financially sound, if creatively poor, choice.