Mac doesn't recognize Seagate external hard drive

I've been using a Seagate Free Agent Go Flex external hard drive to back up as Time Machine.  Today, I plugged in the hard drive and my mac didn't see it in Finder.  I could see it in disk utility.  I ran verify and that failed and told me to repair the volume.  I ran repair and it failed and gave me the following message, "Disk Utility Stopped repairing Free Agent Go Flex Mac OS Extended Format.  Disk Utility can't repair this disk.  Back up as many of your files as possible, reformat the disk, and restore your backed-up files."  Since I can't see the disk in Finder, how can get the files off the external drive?  Has anyone else had experience with this?
Thanks!

Well, it's either erase it/them, or trry stronger Disk Repair Utilities...
You must repair the HD,  if Disk Utility or fsck should fail to repair it, your best bet is DiskWarrior from Alsoft, you'll need the CD to boot from if you don't have another boot drive...
http://www.alsoft.com/DiskWarrior/
Your best bet is DiskWarrior, you need the CD/DVD though.
http://www.alsoft.com/DiskWarrior/
But others that may work…
Drive Genius…
http://www.prosofteng.com/products/drive_genius.php
TechTool Pro…
http://www.micromat.com/index.php?option=com_content&task=view&id=31&Itemid=83

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