I just updated my Mac to Yosemite OS X 10.10 and while the update and install were being performed I had an external HD that was connected and everything was wiped from it. All of my folders and the folder structure is still there, but the folders are empty. When I look at the "get info" on the HD, it still appears that all my files should be there, given the data used/available, so I'm hopeful it can be recovered, but not sure what to do. I ran the verify and repair disk in the Disk Utility and it didn't report any errors, but it also didn't bring back any of the files. Any help or ideas would be GREATLY appreciated!