Currently Being ModeratedJul 19, 2012 12:24 PM (in response to imunster)
Those are the read / write heads scanning over the plattens. This may indicate a problem, but it may also be that something may have heated up and is not transfering the sound to the unibody mechanically (in other words, something is now touching the drive that touches the unibody). The drive does not sound abnormal, but if it does get louder it will fail. Are you noticing problems? Get some disk utility to check it out.
Currently Being ModeratedJul 19, 2012 12:46 PM (in response to idaveb)
I am not experiencing any problem with the computer itself. Everything seems to run fine. The sound appears every now and then, enough to bother me though it's not very loud.
Maybe I should take it to the genius bar just in case?
Currently Being ModeratedJul 19, 2012 12:59 PM (in response to imunster)
Had it been a constant humming, I would have said a fan was dirty, but this is definitely the sound of an HDD doing its seeks as expected ("seek" is the computer term for when a disk drive head is being moved to and fro across the platters to locate a specific bit of data). Some brands of drives are much noisier than others and it is a normal sound. All do this in some form or other. If it increases over time, then it is a sign of impending failure. Open Disk Utility, click on the HDD device (NOT the Macintosh HD volume) and check the S.M.A.R.T. status, in the bottom part of the window. If it is anything different from "Verified", it will need replacement ASAP. Or if it is bothersome, take it to the Bar anyway.
Currently Being ModeratedJul 19, 2012 1:20 PM (in response to Courcoul)
It says verified. I believe I will take it to the genius store anyways. Thanks for your help. It is good knowing that it isn't something to be immediately worried about!
Currently Being ModeratedJul 19, 2012 1:23 PM (in response to imunster)
It is proably normal as all drives make that noise. I could see on the screen you were doing an install and that is a lot of drive seeks. I didn't hear anything that was a problem on the video.
Currently Being ModeratedApr 20, 2013 12:35 PM (in response to imunster)
Have you sorted the problem yet? I have exactly the same noise. I've got a feeling its where i've dented it and the fan is rubbing or something