Today I helped customer who had used Data Rescue 3 for Mac to clone their problem hard drive to a disk image on one of their other drives. The clone had finished successfully but he was not sure what to do at this point. He had tried opening the disk image file but it would not open and then he began a scan on the 2TB drive where this disk image was stored. Since the scan was going to take a while he decided to call Support to make sure his procedure was correct. I told him that instead of scanning the entire drive, he would need to run a Deep Scan on the disk image file itself. I walked him through how to do so by adding the disk image file to the Scan Sources and selecting it as the Source. When the scan finished he was able to recover all of the files from the disk image clone and was very satisfied.
Try before you buy! Here is the free trial of Data Rescue 3 for Mac.