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Subject:	RE: Re: dd Bug using \.\PhysicalDriveX ?
Date:	Thu, 20 Sep 2007 10:14:48 -0400
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From:	"Scalzott, Todd" <tscalzott AT kastle DOT com>
To:	"Eric Blake" <ebb9 AT byu DOT net>, <cygwin AT cygwin DOT com>
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Thank you for the correction on coreutils.

Yes, I am using cmd.exe.  The quotes are necessary (try it) or dd goes
off searching for an UNC.

I have  no problem using /dev/sdb, etc., but others that need to know
how to do a simple image burn do.  So believe it or not, the physical
drive mapping is easier for them.

Thank you all for your help 

-----Original Message-----
From: Eric Blake [mailto:ebb9 AT byu DOT net] 
Sent: Wednesday, September 19, 2007 2:24 PM
To: cygwin AT cygwin DOT com
Subject: Re: dd Bug using \.\PhysicalDriveX ?

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



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