Best Data Recovery: Why data recovery is best done on hard drive that has not been tampered

Hard disks that have not been tampered with are easier to handle.
It is easier to look for physical failures as they may have occurred and decide on the best way to handle the mistake. Disk that have been fixed by unqualified technician are difficult to handle as they may be excessively tampered to an extent that the data expert can not recognize exactly where the mistake may have occurred.

Retrieving information from the disk can be difficult if the device was opened in an environment not meeting the required conditions for handling disks. The air has particles that if they land on the magnetic disc, the heads of the device may have difficulty in reading and writing to the disk. Data recovery process may to be difficult if the original data has been tampered with. The result information may be different from what is expected. Or the information may be completely unrecoverable.

Opening the device may disqualify you from getting warranty services that are offered by the manufacturers. By opening the machine not only do you change the original settings of the device but also cause more damage to other parts that may not have any spare parts. Taking you device to the expert is advantageous as the expert may have the rights from the respective company to open the device. And this is usually free

Best recovery is only possible with the experts who handle storage devices, it is advisable to avoid tampering the interior of the device as this may lead to your data been completely irrecoverable