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Date:      Wed, 06 Mar 2002 16:51:01 +0000
From:      Peter Edwards <peter.edwards@openet-telecom.com>
To:        Zhihui Zhang <zzhang@cs.binghamton.edu>
Cc:        "Brian T.Schellenberger" <bts@babbleon.org>, Lars Eggert <larse@ISI.EDU>, "Rogier R. Mulhuijzen" <drwilco@drwilco.net>, Julian Elischer <julian@elischer.org>, freebsd-hackers@FreeBSD.ORG
Subject:   Re: A weird disk behaviour
Message-ID:  <3C8648F5.1EC1E4EE@openet-telecom.com>
References:  <Pine.SOL.4.21.0203061132090.5743-100000@onyx>

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Zhihui Zhang wrote:

<snip>

> ... I also do not read anything during the partial block write,
> and I think the disk controller should not do that either.

If you do a partial block write, surely at some point the block must be read
in order to preserve that segment of data you are _not_ overwriting?

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