linux-kernel - Re: [Patch] document ext3 requirements (was Re: [RFD] Incremental fsck)

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Date:	Thu, 17 Jan 2008 13:37:04 -0800
From:	Bryan Henderson <hbryan@...ibm.com>
To:	"Daniel Phillips" <phillips@...gle.com>
Cc:	"Al Boldi" <a1426z@...ab.com>,
	"Alan Cox" <alan@...rguk.ukuu.org.uk>,
	"David Chinner" <dgc@....com>, linux-kernel@...r.kernel.org,
	"Pavel Machek" <pavel@....cz>, "Rik van Riel" <riel@...hat.com>,
	"Theodore Tso" <tytso@....edu>,
	"Valerie Henson" <val.henson@...il.com>
Subject: Re: [Patch] document ext3 requirements (was Re: [RFD] Incremental fsck)

"Daniel Phillips" <phillips@...gle.com> wrote on 01/16/2008 06:02:50 PM:

> On Jan 16, 2008 2:06 PM, Bryan Henderson <hbryan@...ibm.com> wrote:
> > >The "disk motor as a generator" tale may not be purely folklore. When
> > >an IDE drive is not in writeback mode, something special needs to 
done
> > >to ensure the last write to media is not a scribble.
> >
> > No it doesn't.  The last write _is_ a scribble.
> 
> Have you observed that in the wild?  A former engineer of a disk drive
> company suggests to me that the capacitors on the board provide enough
> power to complete the last sector, even to park the head.

No, I haven't.  It's hearsay, and from about 3 years ago.

As for parking the head, that's hard to believe, since it's so easy and 
more reliable to use a spring and an electromagnet.

--
Bryan Henderson                     IBM Almaden Research Center
San Jose CA                         Filesystems

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