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Is there an application that locates redundant files on the hard drive? Files that are not crucial for the system to run. I'm running Windows 7.

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Redundant isn't the same as non-crucial to the system. – random Mar 30 '10 at 9:47
If Windows 7 understands (and uses) hard links (, then it might be hard to tell if the "redundant" file is actually using additional disk space? – Arjan Mar 30 '10 at 10:23

I really like Clonespy.

It's free, and it's stable enough to handle scanning millions (10,000,000+) of files (I've actually managed to crash several other similar pieces of software (noclone)).

On the downside, it's a bit complex at first, but it's quite capable once you've used it a bit.

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finally found the answer, fyi this is what I was looking for:

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