Yesterday I took out the 160gb. hard drive that came in my mac and installed a 500gb. western digital hd in its place. The installation of Snow Leopard went well and time machine worked perfectly for restoring my data. Everything seems to be working fine, but I am hearing a funny noise coming from the area where the hard drive is. I know that hard drives are supposed to make faint noises due to the spinning, but this is different. It's loud enough to hear over a song playing in iTunes. In the reviews for the hard drive people said it was quieter than their original MacBook HD. Could I have possibly done something wrong in the installation? I'm not sure if I should go through the trouble of opening my MacBook up again...