Hard disk making click sound

I have this Dell Latitude D830, and for the past few days, hard disk makes some kind of click sound. The kind of sound that appears when one dock-in the laptop to a docking station. Moreover, the appearance of click sound also freezes the system for a moment.

Well, I read a couple of post on this issue, and finally came to the conclusion that this is a known issue with dell laptops and the problem is with the hard disk for sure. The sound is because of the spindle arm resting to the left. It goes for a rest and makes a sound. The solution is replace the hardisk

Well, I just thought when did this problem started. It started on the evening I was supposed to leave for dublin i.e. 19th Sep. So what is that I did on that day that can make my laptop cry out. As far as I remember I changed the power settings. Now, I have reverted back the power settings, lets see what happens now. But this problem has already spoiled quite a few days.

The moral of the story is, I am not happy with the quality of dell laptop. I have been using samsung laptop before, and they work so good.