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Hard Disk failure I believe is the nightmare for everyone, normal hard disk life span around 4-5 years, sometime will be shorter depend how you use it. So the hard disk come with Blue, Red, Green, Black .etc. Every type of hard disk have surf his purpose. To diagnostic the hard disk there a free software to check the SMART status. which I am currently using is crystal disk info.
and you can simply get it here http://crystalmark.info/download/index-e.html
