hard drive diagnostics app?

[iDoiStuff]

I have a feeling my hard drive in my iMac is failing, its making funny noises, clicking and it revs then stops, revs then stops.

I was wondering if their is an app to run and tell me if my hard drive is failing? thanks.

 

[alust2013]

Search for SMART utility, and that should tell you.

 

[walterwhite]

Drive Genius 3 works great for me... even emails me when there are problems...
http://www.prosofteng.com/products/drive_genius.php

 

[iDoiStuff]

Here are my results. Whats it mean?