Mailing-List:	contact cygwin-help AT sourceware DOT cygnus DOT com; run by ezmlm
List-Subscribe:	<mailto:cygwin-subscribe AT sourceware DOT cygnus DOT com>
List-Archive:	<http://sourceware.cygnus.com/ml/cygwin/>
List-Post:	<mailto:cygwin AT sourceware DOT cygnus DOT com>
List-Help:	<mailto:cygwin-help AT sourceware DOT cygnus DOT com>, <http://sourceware.cygnus.com/ml/#faqs>
Sender:	cygwin-owner AT sourceware DOT cygnus DOT com
Delivered-To:	mailing list cygwin AT sourceware DOT cygnus DOT com
Message-ID:	<386BE336.8D1437D1@vinschen.de>
Date:	Thu, 30 Dec 1999 23:56:54 +0100
From:	Corinna Vinschen <corinna AT vinschen DOT de>
X-Mailer:	Mozilla 4.7 [en] (WinNT; I)
X-Accept-Language:	de,en
MIME-Version:	1.0
To:	Bob McGowan <Robert DOT McGowan AT veritas DOT com>
CC:	Cygwin <cygwin AT sourceware DOT cygnus DOT com>
Subject:	Re: physical disk access
References:	<386BCF1A DOT 667751E3 AT veritas DOT com>

Bob McGowan wrote:
> [...]
> I wanted to use dd to verify disk sizes on reads and writes, so I used
> the following two commands:
> 
>   dd if='\\.\F:' of=/dev/null bs=1024k
>   zero | dd of='\\.\F:' bs=1024k
> 
> where the command zero just generates null bytes on standard out.
> [...]
> I would have expected dd to work for both in and out operations under
> these circumstances.  Any idea why it didn't?
> 
> I am running the Cygwin 1.0 environment from the CD, no updates.

If you want to use raw devices with cygwin you have to mount them.
Some examples:

  mount -f -b -s //./F:  /dev/hdb2             # partition
  mount -f -b -s //./physicaldrive0 /dev/hda   # hard disk
  mount -f -b -s //./tape0 /dev/st0            # rewind tape
  mount -f -b -s //./tape0 /dev/nst0           # same as norewind

In further commands you have to use the mountpoints for correct
results:

  dd if=/dev/hdb2 of=/dev/null bs=1024k
  zero | dd of=/dev/hdb2 bs=1024k

Hope, this helps,
Corinna

--
Want to unsubscribe from this list?
Send a message to cygwin-unsubscribe AT sourceware DOT cygnus DOT com

- Raw text -