Tonight came another parcel for repair with their hard drives. The most urgent was Samsung ST500LM012 with a complaint from a client on a knock and not the definition of a laptop.
If you connect a hard began publishing cyclical shocks, I think the head on the spindle.
The work was very much and understand much, what with the cost, Yes it is a cost not normally conclude that all the fault of BMG and begin to turn a calibration screw, and when this action does not help.
Open hard and long staring at the head, some dare to change even a successful replacement that unfortunately the case is still rare among average statistical service practices.
Get again the definition of the system. I just switched the Board with another of the same hard, the benefit of these boards enough. It should be noted that I don't even rearrange ROM. These models hard disk easily determined without it.
After that, the hard right decided, and after two hours of tests that did not reveal more defects. Was packaged for shipment back to the customer.