From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Lord <liml@rtr.ca>
Subject: Re: [git patches] libata hibernation fixes
Date: Tue, 04 Nov 2008 21:10:27 -0500
Message-ID: <49110093.5090506@rtr.ca>
References: <fa.Ast7pgG6P20u1PcyOsfgzoaX5YA@ifi.uio.no> <fa.1+JQHm7yjIiZJxAzR0eBPn39a9M@ifi.uio.no> <fa.8GbzH83c2CAI53n9dyzVOFugmoc@ifi.uio.no> <fa.hGdpNHQGmXAR19JiGuHxSr9N9CA@ifi.uio.no> <4910E6CD.9090605@mail.usask.ca>
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To: Robert Hancock <rwh461@mail.usask.ca>
Cc: Linus Torvalds <torvalds@linux-foundation.org>, Pavel Machek <pavel@suse.cz>, Jeff Garzik <jeff@garzik.org>, Andrew Morton <akpm@linux-foundation.org>, linux-ide@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>

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.

Cheers