Case:
The Samsung 160GB hard disk by the customer is installed in Lenovo notebooks. The notebook is moved by the customer when the notebook is turned on. After accidentally colliding, the notebook automatically restarts. After the restart, it cannot enter the system.change.
Solution:
This kind of failure is similar to that the magnetic head is stuck and caused the motor to not turn. After detection, the motor chip has an input voltage but no output. The magnetic group chip work is normal.It is likely that there is a problem with the main control and the motor chip.So replacing the circuit board, but found that the magnetic head was really stuck, manually reset the magnetic head, re -power the power, the motor works normally, but knocking on the disk, he had to replace the magnetic head.The final data recovery was successful.