It is rather risky to repair hard drive partitions on a damaged hard disk drive. You may even utilize one of the greatest tools and be certain in your actions, you are still risking to lose your data. Alterations that can be made to the damaged drive are irreversible. You must bear in mind that it's rather easy to overwrite the structure of essential information about your disk. Firstly the substitute must be provided before the start of the recovery procedure.
But there are also some other methods of file repairing that are safer and simpler in usage, that don't demand to have backup and repair info. There's a system of total binary snapshot that you can apply to your drive or the partition that is being repaired. After that you may make a repairing with the various methods on this image for as many variants as you demand. That's the goal of data recovery software.