I am in search of a really good data recovery app. I have precious photos and video files that I cherish very much on this external hard drive. Whenever I plug it into my computer, nothing appears in Finder. It appears on Disk Utility though. I tried repairing it, but it tells me that I should try to recover the files, back it up, and reformat it. And that's why I need a data recovery app. Do you guys have suggestions? Thanks.