I looked inside my 522 today and was shocked at what I found. I burned my fingers on the HD! It was super hot. I then took the 3 screws out to remove the drive case (warranty tag was not in a place that would keep me from doing this). Under the HD there is a fan that is not operating. If it is supposed to operate on temperature, it is not. Heat is bad for HD's. It can warp the disks, and kill electronics.
While mine has not failed, with this condition it is more of a when it fails than if it fails.
While mine has not failed, with this condition it is more of a when it fails than if it fails.