linux-kernel - Re: [PATCH 3/5] libata: Implement disk shock protection support

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Message-ID: <20080805200021.GF7939@elf.ucw.cz>
Date:	Tue, 5 Aug 2008 22:00:21 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Eric Piel <eric.piel@...mplin-utc.net>
Cc:	Theodore Tso <tytso@....edu>, Robert Hancock <hancockr@...w.ca>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Gabor Gombas <gombasg@...aki.hu>, Tejun Heo <htejun@...il.com>,
	Elias Oltmanns <eo@...ensachen.de>,
	Jeff Garzik <jeff@...zik.org>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] libata: Implement disk shock protection support

On Tue 2008-08-05 17:14:02, Eric Piel wrote:
> Theodore Tso schreef:
>> The real right answer though is to buy one of the laptop drives (such
>> as the Seagate Momentus 7200.2 or 7200.3) which has the anti-shock
>> detection built directly into the hard drive.  That way you don't have
>> to have a daemon that sits in the OS waking up the CPU some 20 to 30
>> times a second and burning up your battery even when the laptop is
>> idle.
> Well, it's not always _that_ bad. For instance, the accelerometer in the HP 
> laptops (lis3lv02dl) can monitor free-falls by itself. When the laptop 
> starts falling, it generates one interrupt.

I was told that "when it starts falling" is too late.

Thinkpads at least tried to detect the movement before fall: before
notebook falls off table, it is very likely to tilt a lot.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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