Today I helped a customer who had an external drive that was no longer mounting on his Mac. He had tried verifying and repairing the drive in Disk Utility but this failed and he did not know what to do. He had a lot of audio recordings and pictures on this drive and wanted to get them back so decided to try using Data Rescue 3. I guided him to downloading the free demo and then try scanning his drive to see if any files could be found. The scan finished and he saw that a lot of audio and pictures could be found so he decided to purchase and activate his copy. I then guided him to recover his files to another drive and he was very happy when the process finished. He was able to find his files and began going through all the recovered files to start reorganizing them.
Try before you buy! Here is the free trial of Data Rescue 3 for Mac.