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From: Bryan Henderson <hbryan@us.ibm.com>
To: "Daniel Phillips" <phillips@google.com>
Cc: "Al Boldi" <a1426z@gawab.com>,
"Alan Cox" <alan@lxorguk.ukuu.org.uk>,
"David Chinner" <dgc@sgi.com>,
linux-kernel@vger.kernel.org, "Pavel Machek" <pavel@ucw.cz>,
"Rik van Riel" <riel@redhat.com>, "Theodore Tso" <tytso@mit.edu>,
"Valerie Henson" <val.henson@gmail.com>
Subject: Re: [Patch] document ext3 requirements (was Re: [RFD] Incremental fsck)
Date: Thu, 17 Jan 2008 13:37:04 -0800 [thread overview]
Message-ID: <OFD3904E7A.3DEFF08C-ON882573D3.0062286D-882573D3.0076C09B@us.ibm.com> (raw)
In-Reply-To: <4d47a5d10801161802x2c24ef59pf8422c8d14d487aa@mail.gmail.com>
"Daniel Phillips" <phillips@google.com> wrote on 01/16/2008 06:02:50 PM:
> On Jan 16, 2008 2:06 PM, Bryan Henderson <hbryan@us.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
next prev parent reply other threads:[~2008-01-17 21:37 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-08 21:22 [RFD] Incremental fsck Al Boldi
2008-01-08 21:31 ` Alan
2008-01-09 9:16 ` Andreas Dilger
2008-01-12 23:55 ` Daniel Phillips
2008-01-08 21:41 ` Rik van Riel
2008-01-09 4:40 ` Al Boldi
2008-01-09 7:45 ` Valerie Henson
2008-01-09 11:52 ` Al Boldi
2008-01-09 14:44 ` Rik van Riel
2008-01-10 13:26 ` Al Boldi
2008-01-12 14:51 ` Theodore Tso
2008-01-13 11:05 ` Al Boldi
2008-01-13 17:19 ` Pavel Machek
2008-01-13 17:41 ` Alan Cox
2008-01-15 20:16 ` [Patch] document ext3 requirements (was Re: [RFD] Incremental fsck) Pavel Machek
2008-01-15 21:43 ` David Chinner
2008-01-15 23:07 ` Pavel Machek
2008-01-15 23:44 ` Daniel Phillips
2008-01-16 0:15 ` Alan Cox
2008-01-16 1:24 ` Daniel Phillips
2008-01-16 1:36 ` Chris Mason
2008-01-17 20:54 ` Pavel Machek
2008-01-16 19:06 ` Bryan Henderson
2008-01-16 20:05 ` Alan Cox
2008-01-17 2:02 ` Daniel Phillips
2008-01-17 21:37 ` Bryan Henderson [this message]
2008-01-17 22:45 ` Theodore Tso
2008-01-17 22:58 ` Alan Cox
2008-01-17 23:18 ` Ric Wheeler
2008-01-18 0:31 ` Bryan Henderson
2008-01-18 14:23 ` Theodore Tso
2008-01-18 15:16 ` [Patch] document ext3 requirements (was Re: [RFD] Incrementalfsck) linux-os (Dick Johnson)
2008-01-19 14:53 ` Pavel Machek
2008-01-18 15:26 ` [Patch] document ext3 requirements (was Re: [RFD] Incremental fsck) Ric Wheeler
2008-01-18 20:34 ` Jeff Garzik
2008-01-18 22:35 ` Bryan Henderson
2008-01-18 15:08 ` H. Peter Anvin
2008-01-18 17:43 ` Bryan Henderson
2008-01-16 21:28 ` Eric Sandeen
2008-01-16 11:51 ` Pavel Machek
2008-01-16 12:20 ` Valdis.Kletnieks
2008-01-19 14:51 ` Pavel Machek
2008-01-16 16:38 ` Christoph Hellwig
2008-01-16 1:44 ` Daniel Phillips
2008-01-16 3:05 ` Rik van Riel
2008-01-17 7:38 ` Andreas Dilger
2008-01-16 11:49 ` Pavel Machek
2008-01-16 20:52 ` Valerie Henson
2008-01-17 12:29 ` Szabolcs Szakacsits
2008-01-17 22:51 ` Daniel Phillips
2008-01-15 1:04 ` [RFD] Incremental fsck Ric Wheeler
2008-01-14 0:22 ` Daniel Phillips
2008-01-09 8:04 ` Valdis.Kletnieks
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