I have the famous--I think--clicking of the HD heads clicking every 10 seconds or so, depending what I do. I believe this is the problem others have described as the heads either parking or re-engaging. I know that an SSD doesn't have moving parts. My question is: Is it possible that this clicking is a different problem. Graphic card driver, or other mechanism within the system. This very light noise that clicks on and off, and disappears when you work constantly within an application, seems to be the one described in multiple forums. I tried the hdapm program, it loads but doesn't work on my Fujitsu 250 GB 5400 HD. I am ready to buy an SSD, but I don't want to do it and discover the problem was something else. I am certainly no expert. The clicking isn't loud or cracking, but it seems to conform to the definition of mice playing ping pong within the system. Any ideas?