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Date: Sat, 11 Mar 2006 20:49:14 -0800
To: Joseph Vella <satyam@sklinks.com>, freebsd-questions@freebsd.org
From: Glenn Dawson <glenn@antimatter.net>
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	<200603111529.44329.satyam@sklinks.com>
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Cc: Wojciech Puchar <wojtek@tensor.3miasto.net>,
	Grant Peel <gpeel@thenetnow.com>
Subject: Re: dd - cloning a disk.
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At 03:29 PM 3/11/2006, Joseph Vella wrote:
>On Saturday 11 March 2006 14:43, Wojciech Puchar wrote:
> > >
> > > Here is a simple (I think!) question for the I/O savy among you:
> > >
> > > If I had two identical disks, say, 73 GB Seagate 10K SCSIs, one 
> completely
> > > operational fully setup FreeBSD with all the trimmings, and the other
>blank,
> > > or perhaps loaded but no longer usable, is 'dd' and appropriate tool to
> > > completely clone the Good disk to the not so good 
> disk....therefor making
>the
> > > second disk identical to the first? Bootable and all?
> >
> > yes
> >
> > dd if=/dev/firstdisk of=/dev/seconddisk bs=64k
> >
> > and yes it is bootable, but if you boot from second disk, FreeBSD kernel
> > will mount root from first disk anyway, unless you will reconfigure it.
> >
>
>Would this also work to copy CDs?  If so, does it matter what os 
>and/or format
>they would have?

You can get an image of a data cd with:

dd if=/dev/acd0 of=foo.iso bs=2048

You can then use burncd to make a copy.  Also note that the block 
size is important here.

-Glenn


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