I'm using a Seagate GoFlex that seems to have encountered some trouble.
The drive does not appear on the desktop or Finder. I've double checked that Finder > Preferences allows for it to appear in both places.
I can see the drive in Disk Utility and have successfully done 'Verify Disk' and 'Repair Disk' however it's worth noting that both 'Verify Disk Permissions' and 'Repair Disk Permissions' are greyed out.
The "Mount" option at the top of Disk Utility is greyed out, however "Eject" is not though when selected I receive that it "could not be unmounted."
I don't quite know what to do next in order to successfully access the Time Machine backups and other files I have stored.
Best Answer
The hard drive randomly started working again after an hour or so left alone.