External HD will not mount

After running disk utility, my External HD will not mount. Is there another app I can run to allow my drive to mount?
jccoonsAsked:
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clausbrochCommented:
There are a number of tools that can help you get the drive up and running or at least tell you what's wrong with it:

Drive 10:
http://www.micromat.com/drive_10/drive_10_introduction.html

TechTool Pro:
http://www.micromat.com/tt_pro_4/tt_pro_4.html
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DominionTechCommented:
Disk Warrior is your best bet.  It will rebuild your catalog structure which is most likely corrupt.
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