To simply change the controller (electronics change) is a bingo which has different chances according to the specific model. With some models - particularly with the newer ones – it is almost not possible at all to change the controller. The tendency is that more and more individual parametres of the hard disk are stored in the controller. We cannot confirm the widespread opinion that while searching for a hard disk identical in construction, one should pay attention to the same manufactory month. Even those hard disk that are identical in construction and that are produced in the same month might use other chips, another number of heads and can have further differences in construction. For the data recovery we need the hard disk with its OWN controller (electronics).