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Date: Sun, 3 Oct 2010 22:27:02 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Polytropon <freebsd@edvax.de>
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Cc: freebsd-questions@freebsd.org, Robert <traveling08@cox.net>
Subject: Re: OT: fdisk
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On Sun, 3 Oct 2010, Polytropon wrote:

> On Sun, 3 Oct 2010 10:00:51 -0700, Robert <traveling08@cox.net> wrote:
>> I have a spare 250G hard drive. Can I use "dd" to capture 250 gigs
>> from the old drive? Using da1 and ad12 as the if and of will the result
>> be an NTFS formatted 250g drive? Will I have the same results, i.e.
>> able to mount ad12 but not ad12s1?
>
> Yes, as dd gives you an 1:1 copy of what you have.

It will give an exact copy of the first 250G, which also means it will 
not resize the 500G filesystem into a working 250G version.

The first step would be a copy of the entire drive.  Then the filesystem 
can be repaired and resized.