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Re: dd Bug using \.\PhysicalDriveX ?
- From: Eric Blake <ebb9 at byu dot net>
- To: cygwin at cygwin dot com
- Date: Wed, 19 Sep 2007 18:24:19 +0000 (UTC)
- Subject: Re: dd Bug using \.\PhysicalDriveX ?
- References: <200709191738.l8JHc8sW019686@zuul.kastle.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
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
> 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.
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