linux-kernel - Re: [git patches] libata hibernation fixes

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Date:	Tue, 04 Nov 2008 20:24:10 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Mark Lord <liml@....ca>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pavel Machek <pavel@...e.cz>, Jeff Garzik <jeff@...zik.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [git patches] libata hibernation fixes

Mark Lord wrote:
> Robert Hancock wrote:
>>
>> IDLE IMMEDIATE just transitions the device to the Idle state, which is 
>> normally parked/unloaded and spun down.
> ..
> 
> No, you're confusing "IDLE" with "STANDBY".  IDLE just puts the drive
> electronics into a lower-power state than "ACTIVE", but normally leaves
> the platters spinning.
> 
> The "UNLOAD" enhancement causes it to also "unload" or "park" (drive's 
> option)
> the heads as part of this action.
> 
> "STANDBY" is the command set which parks heads and spins down the platters.

Right, STANDBY IMMEDIATE was the one I was thinking of.
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