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Date: Mon, 5 Apr 2004 14:50:24 -0500
From: Adam Fabian <afabian@turingmachine.dyndns.org>
To: "J.D. Bronson" <jbronson@wixb.com>
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cc: freebsd-questions@freebsd.org
Subject: Re: diskcopy (dd) on 5.2.1 ?
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On Mon, Apr 05, 2004 at 02:32:37PM -0500, J.D. Bronson wrote:
> I have 2 "100% identical SCSI drives" on my freebsd machine..
> 
> What command can I do in freebsd to 'copy' one drive to another
> completely (including the bootsectors and partition table) ?
> 
> da0
> da1

dd if=/dev/rda0 of=/dev/rda1 bs=16k

seems reasonable to me.  I have a couple of identical IDE drives;
performance doesn't pick up much after 16k blocks, but 16k is many
times faster than the default of 512 bytes.