Extremely loud noise coming from the right side of the engine.

What is your question?

When I start my car the fan belt squeals for a few seconds then is replaced by something that sounds like a Dremel being used to grind or cut hard stone or something metal. It is coming from somewhere near the motor mount that connects to the alternater. It continues as long as the car is in any of the forward drive gears (stops in neutral and reverse) but sometimes, when I go over a speed bump, a rough driveway or a stretch of road with a lot of jarring potholes, it will stop briefly only to return even louder. (It's really embarrassing...:) ). Any ideas?