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RE: Re: dd Bug using \.\PhysicalDriveX ?
- From: "Scalzott, Todd" <tscalzott at kastle dot com>
- To: "Eric Blake" <ebb9 at byu dot net>, <cygwin at cygwin dot com>
- Date: Thu, 20 Sep 2007 10:14:48 -0400
- Subject: RE: Re: dd Bug using \.\PhysicalDriveX ?
- References: A<loom.20070919T201553email@example.com>
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
From: Eric Blake [mailto:firstname.lastname@example.org]
Sent: Wednesday, September 19, 2007 2:24 PM
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
There's no such thing as CORE in the cygwin distribution; you meant
> 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
> 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
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
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