Can anyone recommend software to scan iMac hard drive for errors

Hello Apple Community
Can anyone recommend software to scan iMac hard drive for errors/defects/corruption?
I've been having problems with hard drive for months and it finally froze on me so I reformatted and restored from Time Machine.
Everything is fine now but I just have a feeling I will see the same problems occur because I simply restored to the exact moment from where I was having problems (i.e. Finder crashing/permissions issues/Volumes unmounting/Trash not working/Random error messages/Computer crashing when opening or saving PNG).
I read that sometime Disk Utility doesn't always pick up on a defect or corrupt hard drive. The whole time I was having problems Disk Utility said HD was ok.
Is there software that can do a better job of scanning hard drive for errors and let me know if I need to get HD replaced?
Thanks
Brad

I agree with both. Most important though is you backup your data frequently*:
http://www.macmaps.com/backup.html
That way if a problem should arise, and it is a result of the hard drive actually dying, you won't accidently kill the hard drive in the process of trying to detect errors.

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