Please! Need help, a lot of information is on this hard drive, mostly videos I filmed and stills. It's a Seagate FreeAgent GoFlex External Hard Drive, over a year old, used it over the weekend, connected it last night, I got that message, it won't appear on the Finder. What can I do so my mac reads the hard drive again and show my files? I don't want to do anything yet because I'm afraid I'll erase any data on my hard drive.