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When I try to extract a file using rar it is outputting failed on random files.

My command:

unrar x arma.rar

What is causing this problem?

OS is Ubuntu 12.04

Edit - it is also happening on different rar files as well as a rar file that I created myself.

share|improve this question
Is this for every .rar file you try, or only for the one you specified? Try to make a .rar file with >3 files yourself, and see if that works. – Jeroen Baert Apr 14 '13 at 18:25
Sorry made a mistake, it's not happening consistently with every third file. Files are failing with other rar files as well, not just this one, including one I rar'd myself. – Colin747 Apr 14 '13 at 18:31
If you're sure the archives aren't corrupted I recommend you start by testing your HDD and RAM. – Karan Apr 15 '13 at 16:16

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