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Date:      Mon, 30 Sep 2002 16:45:26 -0700
From:      Mike Hogsett <hogsett@csl.sri.com>
To:        "Pranav A. Desai" <pdesai1@cs.uh.edu>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: how to use 'dd' to create image of a hard drive? 
Message-ID:  <200209302345.g8UNjQZN049714@axp.csl.sri.com>
In-Reply-To: Message from "Pranav A. Desai" <pdesai1@cs.uh.edu>  of "Mon, 30 Sep 2002 18:39:09 CDT." <Pine.GSO.4.33.0209301830510.1900-100000@themis.cs.uh.edu> 

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Please anyone correct me if I am wrong, but I believe that when you are
using dd with a raw disk blocksize only effects performance and does not
have any effect on the duplicated data.

> Hi !
> 
> 	Thank you all for your prompt replies. You have said in your
> replies that the bs parameter should be set appropriately. Is there a way
> to find out appropriate block size, or any reasonable size should do, like
> 1k or 4k. I am asking because I tried it a few weeks ago and I was unable
> to mount the new drive let alone boot from it. Mostly I must have done
> something wrong.  I dont have access to another drive or else I could have
> tried it again. Let me know if any block size will do or should it be
> specific.
> 
> Thanks
> -Pranav
> 
> *******************************************************************
> Pranav A. Desai
> 
> Home :- (937) 294 1381
> *******************************************************************
> 
> On Mon, 30 Sep 2002, Jack L. Stone wrote:
> 
> > At 04:02 PM 9.30.2002 -0700, David Smithson wrote:
> > >> >> >Hi all!
> > >> >> >
> > >> >> > Can I use something like
> > >> >> >
> > >> >> >dd if=/dev/ad0 of=/dev/ad1
> > >
> > >Yes.  This will work fine.
> > >
> > >> NO! An entire image is taken of the ad0 and no labeling is necessary. It
> > >is
> > >> bootable already.
> > >>
> > >> Best regards,
> > >> Jack L. Stone,
> > >> Administrator
> > >
> > >I agree with Jack.  However, if you want to boot from it as "ad1" or
> > >whatever, I think you'll have to tweak your bootloader settings a little
> > >bit.  Right?
> > >
> >
> > Yes, or if it is for a backup for ad0, just switch the cable and reboot....
> .
> >
> > Best regards,
> > Jack L. Stone,
> > Administrator
> >
> > SageOne Net
> > http://www.sage-one.net
> > jackstone@sage-one.net
> >
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > with "unsubscribe freebsd-questions" in the body of the message
> >
> 
> 
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