I heard this on Mac Geek Gab.  Drive Genius is the best for fixing hard drives with issues.  Same software Apple Genius use. Though I would make a note.

Drive Genius: Software to Maintain, Manage and Optimize your Hard Drive

My attempt at setting up an old PC for using Spinrite is finally a success.

1. I had to find an old PC that would boot from CDROM.
2. I had set the CDROM to master.
3. I had to set the drive to Cable Select or Slave.  This may take some tweaking. I have not found a pattern yet.

I have heard that Mac OS X doesn’t need the likes of Spinrite.  I had heard that the journaling property of the OS X extended journaled file system actively maintains the drive, in a sense doing what spinrite does continually.
I have given spinrite two drives that we knew were bad or going bad.  So far the drives were so bad that spinrite could not fix.
I am going to try some more drives that I have access to.
The problem is that I need to know prior to drive failure (under Mac OS X), so that I can rescue the drive data before total failure.

GRC | Hard drive data recovery software I have heard much about this data recovery software. Now I have a friend who owns it and a drive that we think is bad.