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Date: Mon, 13 Nov 2006 12:58:10 -0500
From: Mark Lord <lkml@rtr.ca>
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To: Jeff Garzik <jeff@garzik.org>
Cc: Andi Kleen <ak@suse.de>, Pavel Machek <pavel@ucw.cz>,
       John Fremlin <not@just.any.name>,
       kernel list <linux-kernel@vger.kernel.org>, htejun@gmail.com,
       jim.kardach@intel.com
Subject: Re: AHCI power saving (was Re: Ten hours on X60s)
References: <87k639u55l.fsf-genuine-vii@john.fremlin.org> <20061113142219.GA2703@elf.ucw.cz> <45589008.1080001@garzik.org> <200611131637.56737.ak@suse.de> <455893E5.4010001@garzik.org>
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Jeff Garzik wrote:
> Andi Kleen wrote:
>
>> How does it shorten its life?
> 
> Parks your hard drive heads many thousands of times more often than it 
> does without the aggressive PM features.

Spinning-down would definitely shorten the drive lifespan.  Does it do that?

Parking heads is more like just doing some extra (long) seeks.
Is this documented somewhere as being a life-shortening action?

Cheers