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Date: Thu, 29 Nov 2007 19:01:46 +0100 (CET)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Steve Franks <stevefranks@ieee.org>
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Cc: User Questions <freebsd-questions@freebsd.org>
Subject: Re: ataidle - causing apache & cvs timeouts
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> I'm running ataidle on my personal server to save electricity.

saving your drive instead of electricity is much more economic.
all drives prefers running in stable environment - like being up 24h/day.

average drive takes <10Watts , so it's <90kWh/year.
in Poland it's about 30PLN/year, assuming your drive is down half time you 
will save 15PLN/year which is about six US dollars :)

much less that increased chance of drive failure.