linux-kernel - 答复: Disk spin down issue on shut down/suspend to disk

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Date:	Tue, 7 Aug 2007 17:51:52 +0800
From:	"sam song" <sam_song@...sh.com>
To:	"'Tejun Heo'" <htejun@...il.com>
Cc:	"'Michael Sedkowski'" <sedmich@...il.com>,
	"'Rafael J. Wysocki'" <rjw@...k.pl>,
	"'Henrique de Moraes Holschuh'" <hmh@....eng.br>,
	<linux-kernel@...r.kernel.org>, <linux-ide@...r.kernel.org>,
	<linux-acpi@...r.kernel.org>
Subject: 答复: Disk spin down issue on shut down/suspend to disk

Tejun Heo wrote:
> Michael Sedkowski wrote:
> > Dnia 07-08-2007, Wt o godzinie 15:56 +0900, Tejun Heo napisał(a):
> >> 192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age
> >> Always       -       388
[snip]
> On power off, the r/w heads in a disk should be unloaded (parked).  This
> is usually achieved by either putting the disk into standby/sleep mode
> during shutdown.  However, all modern disks can automatically unload
> their heads when the power is removed abruptly.  This is called
> emergency unload.  Emergency unload does shorten the lifespan of the
> disk but you don't have to worry too much about it.  Disks are designed
> to withstand certain number of emergency unloads.

Out of interest, does Power-Off_Retract_Count attribute only record emergency unloads
rather than normal power off by Linux shutdown command?

Thanks in advance,

Sam

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