Jim Henderson schrieb:

> See my anecdotal evidence in reply to Stefan.  Two identical units, one 
> powered on and off regularly, one that was left on 24x7.  Guess which one 
> failed?  Not the one that has been turned on and off regularly for 5 
> years now.  The one that was plugged in and running for 3 years solid.

I wouldn't be too much surprised if HDD manufacturers would know ways 
how to optimize drives for one usage pattern or the other, so that maybe 
indeed powering up and down might kill a server HDD quickly, while 24x7 
usage might shorten the life of an office computer / consumer HDD.

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