Mailing-List: contact cygwin-help@sourceware.cygnus.com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@sources.redhat.com Delivered-To: mailing list cygwin@sources.redhat.com Date: Thu, 20 Sep 2001 09:12:50 +0200 From: Corinna Vinschen To: cygwin@cygwin.com Subject: Re: dd, physical devices, permission denied Message-ID: <20010920091250.B4194@cygbert.vinschen.de> Mail-Followup-To: cygwin@cygwin.com References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: ; from bastian@hc.ti.com on Wed, Sep 19, 2001 at 06:12:46PM -0500 On Wed, Sep 19, 2001 at 06:12:46PM -0500, Jeff Bastian wrote: > > I see that the naming mechanism for drives has changed from //X to > /cygdrive/X with the newest release. > > However, I'm having problems with the raw disk devices themselves. > > I was using Cygwin B20 until I upgraded today. The old method > doesn't work: > > [Administrator]$ dd if=dos622.img of=//./a: > dd: opening `//./a:': Bad address Excerpt from the Online User's Guide: http://cygwin.com/cygwin-ug-net/using-specialnames.html To access those devices you have to mount them and you have to use the posix name of the device to be recognized by Cygwin. > So, I tried just 'a:' for the device, but it says permission denied: > > [Administrator]$ dd if=dos622.img of=a: > dd: opening `a:': Permission denied > > Trying another method yields the same thing: > > [Administrator]$ mount -s -b a: /dev/fd0 > mount: warning - /dev/fd0 does not exist. > [Administrator]$ dd if=dos622.img of=/dev/fd0 > dd: opening `/dev/fd0': Permission denied So you forgot to check the remaining method: mount -s -b //./a: /dev/fd0 I'm going to remove the need to mount the devices in one of the next Cygwin versions but note that you will have to use the POSIX names of the devices to get raw device support regardless. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Developer mailto:cygwin@cygwin.com Red Hat, Inc. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/