I am new to the world of portable computing with a late 2008 mbp. I've noticed though, that there is a small click sound that emanates from the bottom right corner (the hdd?) sometimes when i shift the computer. Its only ever happened when the computer is moved... so i'm wondering if its like the drive head parking as a precaution against sudden moves, or if my drive is just wonky? They aren't violent shifts, literally i can be simply picking up the computer to move to another room or something. Thanks for any advice!