X-Recipient: archive-cygwin@delorie.com
X-Spam-Check-By: sourceware.org
To: cygwin@cygwin.com
From: Eric Blake <ebb9@byu.net>
Subject:  Re: dd Bug using \.\PhysicalDriveX ?
Date: Wed, 19 Sep 2007 18:24:19 +0000 (UTC)
Lines: 38
Message-ID:  <loom.20070919T201553-694@post.gmane.org>
References:  <200709191738.l8JHc8sW019686@zuul.kastle.com>
Mime-Version:  1.0
Content-Type:  text/plain; charset=us-ascii
Content-Transfer-Encoding:  7bit
User-Agent: Loom/3.14 (http://gmane.org/)
X-IsSubscribed: yes
Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm
List-Id: <cygwin.cygwin.com>
List-Subscribe: <mailto:cygwin-subscribe@cygwin.com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin@cygwin.com>
List-Help: <mailto:cygwin-help@cygwin.com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner@cygwin.com
Mail-Followup-To: cygwin@cygwin.com
Delivered-To: mailing list cygwin@cygwin.com

Scalzott, Todd <tscalzott <at> kastle.com> writes:

> 
> I believe that this is part of CORE, which I have at 6.9-5.  I did
> update to all of the latest just a short while ago and reverified the
> problem.

There's no such thing as CORE in the cygwin distribution; you meant coreutils.

> 
> I've discovered what I believe to be a problem with "dd" on several
> different XP SP2 systems with Cygwin installed involving the usage of
> Windows' \\.\PhysicalDrive nomenclature.

That's your problem.  Cygwin is a Linux emulation, and use of Window's \\.\ 
nomenclature is not guaranteed to work.  Using the corresponding posix-y name 
is more likely to succeed, in which case the bug is not in dd but in your usage.

> 
> That is, reading from \\.\PhysicalDrive1 with the below command works
> flawlessly:
>     dd if=^\^\.^\PhysicalDrive1 of=tmp.img bs=16384

That's an unusual quoting style; it certainly doesn't work under bash.  Are you 
by chance trying this under cmd.com?  In which case, why are you bothering with 
quoting? cmd.com passes \ through without the need for quoting.

At any rate, what you probably wanted something more like this (less typing, 
and no need for quoting, whether in cmd.com or bash):

dd if=tmp.img of=/dev/sda bs=16K

See http://cygwin.com/cygwin-ug-net/using-specialnames.html for more details.

-- 
Eric Blake
volunteer cygwin coreutils maintainer



--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/