It's really dangerous process to fix drive partitions on a corrupted hard drive. You can even use one of the greatest tool sets and be certain in your deeds, you are still risking to waste your files. You must realize that all the changes that are done to a damaged disk are irreversible. You may simply overwrite vital info about your HDD, files and data. There must be made some backup for your hard drive before the recovery process.
You may find the other method of data restoration process that can be even safer and simpler and it does not need to have backup. You may not make a backup copy of the disk, but you can create a total double image of it or its partition. Then you can continue repairing with different settings for so many times as you wish. This is one of the methods that is used in photo recovery software.