Me and My friend recently both got new i7 MacBook Pro's, My friend got the i7 2.66 stock, and I got the 2.8 i7 Anti Glare. Both of our Machines have the same Hard Drive. The Hitachi HTS545050B9SA02. This is a 500GB 5400RPM Hard drive, but both of our machines exhibit very similar behavior. The drive (right palmrest) occasionally clicks, and when you move the computer a little it clicks. I have turned off "Put Hard Drives to sleep when possible" on both of our computers and it still does this. Is this a common issue or is it normal?