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Date:      Tue, 1 Oct 2002 01:27:24 +0100 (BST)
From:      Richard Tobin <richard@cogsci.ed.ac.uk>
To:        "Jack L. Stone" <jackstone@sage-one.net>, "Pranav A. Desai" <pdesai1@cs.uh.edu>, <freebsd-questions@FreeBSD.ORG>
Subject:   Re: how to use 'dd' to create image of a hard drive?
Message-ID:  <200210010027.BAA18320@sorley.cogsci.ed.ac.uk>
In-Reply-To: Jack L. Stone's message of Mon, 30 Sep 2002 19:10:06 -0500

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> bs=102400 or bs=128k will dd faster though.... you can play with that.

That's not my experience.  8k dd runs at disk speed (30-40 MB/s) on
all the machines I've used recently when copying between different
disks on different ATA controllers.  Between disks on the same
controller I only get about 13MB/s (why?) but there's no difference
between 8k and 128k dd.

-- Richard


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