Replacing Hard Drives

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http://serverfault.com – I was wondering if it is a good idea to replace a hard drive in a (fairly) system-critical database server after a certain number of years of use, before it dies. For example, I was thinking of replacing a hard drive after 3 years of use. Since I have many hard drives across servers, I could stagger which hard drives are replaced. Any of you do this? (HowTos)