[all variants] What's up with my hard drives?

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http://ubuntuforums.org – Below is my current smart data from 3 hdd's in my mythbuntu system running as a home server. The system does run 24/7 and gets a fair bit of use. The drives are between 2 and 3 years old, which I would consider to be somewhere in the middle of their life expectancy. I have had other drives in this system that have exhibited these kinds of error and eventually failed. So, 1) Is this level of errors within expected range for drives this age? 2) Are any of them in imminent danger of failure? 3) Is there something up to be causing this ongoing issue? Thanks Phil Code: smartct (Hardware)