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    As a corollary, have a spare sitting around for when a drive does go bad. Also, beware of silent corruption... it's easy to lose data on a drive that's only pretending to work. Commented Jul 23, 2009 at 19:33
  • This is another reason that you should not install drives that are all from the same batch in a RAID array - they have correlated failure times (y'know, like default rates of tranched subprime collateralized mortgage securities).
    – Andrew Mao
    Commented Sep 16, 2014 at 17:52