If it is a mechanical failure, it is not advisable to use recovery software as it may further damage the drive. Files wanting to be found would then, in the worst case, be impossible to recover. Finally, in the event of a software failure, you should not continue to use the hard disk because during the repair the new data will damage the Data Recovery that must be recovered.
In addition, if the problem is due to a fall or a shock, using the disk for long minutes for the diagnosis could damage the platters. While they were perhaps not reached before. And so the files would be faulty too. Nevertheless, sometimes there is nothing to do and the reason is that the disk is out of order.
For example, if the files cannot be saved, it is likely that the disc is writable and therefore the files are inaccessible. But inaccessible does not mean unrecoverable. It is for this reason that it is not advisable to repair the disk yourself but to call on a professional who will be able to know the right technique to Data Recovery.
To assess the damage, the professional must open the disk in a place free of all particles which could make the hard disk defective. He will be able to know how to make a diagnosis to know what the problem is before undertaking the repairs of the support and to be able to recover the files.
When you have a problem with your hard drive, it is therefore important to go immediately to a professional. It will be able to determine the cause without damaging more than the disc already is. He will know how to make a diagnosis and then propose a solution with the estimated price.
In any case, it is not recommended to try to repair the disk yourself at the risk of it being even more defective and of not recovering the files.
The most important thing is also to remember to keep your important data on another medium to prevent them from being lost permanently if the data is not recoverable.
