Friends, I'm looking for a little advice, because I'm at my wit's end. A little less than a year ago, my then-new amazing 13'' Macbook Pro took a fall, but everything seemed survive intact, except the hard drive (and the warranty). I was really relieved, when I successfully installed a new hd and was even able to recover the data off the old, busted one. But, right after I started up with the new one, I noticed it was a lot louder (kinda a constant shhhhhhh sound) and would make clicking noises a couple times a minute. I don't know much about hard drives, but I knew these weren't good signs. Still, I kept using it (became really anal about time machine back-ups in the meantime) but kept thinking, soon enough, I'd buy a new one and replace it. I finally got around to it a couple weeks ago. I replaced a Western Digital Scorpio Blue 500gb, 5400rpm with a Hitachi Travelstar 500gb, 7200rpm. And what did I find? It's louder! It clicks just as much. Could I just be really unlucky to have bought two loud hard drives in a row? Or could it be something with the laptop's set up that's causing extra noise? Or could the drop have done something to the way the sound is muffled? I mean, with the new drive in, I can even feel a slight vibration on the trackpad. I've run the disk utility and everything seems fine. Performance is okay, but the physical noise and occasional clicking is both annoying and troubling. Any ideas?