[Hidden-tech] Hard drive programs for Mac

[fern]

I am looking for hard drive diagnosis and repair software for OSX. I have an external drive right now that can not be repaired with Disk Utility, so I'm looking around for something else to clean it up.

I know there are a few good ones out there-Drive Genius, Disk Warrior and Tech Tools Pro. 

I know these are all similar but have some different features. Anyone have feedback, good or bad on these or others?  

Thanks
Fern
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