It is really risky to repair hard drive partitions on a corrupted hard drive. You can even use one of the best data recovery tools and be certain in your deeds, you are still risking to waste your data. Alterations that can be made to the damaged drive are irreversible. You should bear in mind that it's rather simple to destroy the structure of essential information about your hard dist. Firstly the substitute must be created before the beginning of the recovery procedure.
There's a different way to do file repairing even safer, and without having to backup and restore data shall something go wrong. You may not make a backup replica of the disk, but you can do a total double snapshot of it or its partition. Then you may continue recovering with different settings for so many times as you wish. That's the task of data recovery software.