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Message-ID: <45628358.8080504@gmail.com>
Date: Tue, 21 Nov 2006 13:40:56 +0900
From: Tejun Heo <htejun@gmail.com>
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To: Mark Lord <lkml@rtr.ca>
CC: Jeff Garzik <jeff@garzik.org>, Andi Kleen <ak@suse.de>,
       Pavel Machek <pavel@ucw.cz>, John Fremlin <not@just.any.name>,
       kernel list <linux-kernel@vger.kernel.org>, 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> <4558B232.8080600@rtr.ca>
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Mark Lord wrote:
> 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?

I wrote this in the other thread but writing here too for documentation 
purpose.

* HL-DT-ST DVD-RAM GSA-H30N locks up completely on slumber.  Physical 
power removal and reapply is the only to recover it.

* Some WD raptors spin down (yeap, that's right, it spins down) on slumber.

Wonderful world of ATA.  :-P

-- 
tejun