Hey. I turn to you with a problem to my computer every hour ( from the startup or from sleep) "looks (search)" of the disk in the drive (the drive has a bit sound). I just can not find out what the application can do this problem. If you have any ideas it would be very fine. (MacBook 4.1 White Lion 10.7.4) I re-installed the system, but a few days after the search of the cd began again.