From owner-freebsd-questions Thu Nov 8 7:12:36 2001 Delivered-To: freebsd-questions@freebsd.org Received: from nelly.internal.irrelevant.org (irrelevant.demon.co.uk [158.152.220.121]) by hub.freebsd.org (Postfix) with ESMTP id 6924F37B417 for ; Thu, 8 Nov 2001 07:12:30 -0800 (PST) Received: from simond by nelly.internal.irrelevant.org with local (Exim 3.33 #1) id 161qqZ-0002aX-00; Thu, 08 Nov 2001 15:12:03 +0000 Date: Thu, 8 Nov 2001 15:12:03 +0000 From: Simon Dick To: Nils Holland Cc: Stijn Hoop , freebsd-questions@freebsd.org Subject: Re: dd and cat - Did I miss something? Message-ID: <20011108151203.B8435@irrelevant.org> References: <20011108123825.E94394@pcwin002.win.tue.nl> <20011108141503.P1041-100000@jodie.ncptiddische.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <20011108141503.P1041-100000@jodie.ncptiddische.net>; from nils@tisys.org on Thu, Nov 08, 2001 at 02:18:05PM +0100 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Thu, Nov 08, 2001 at 02:18:05PM +0100, Nils Holland wrote: > On Thu, 8 Nov 2001, Stijn Hoop wrote: > > > On Thu, Nov 08, 2001 at 12:16:57PM +0100, Nils Holland wrote: > > > Hi folks, > > > > > > I just wanted to copy a data CD. So I thought I'd first read it out. After > > > I had put the CD into my ATAPI CD-ROM drive, I issued the following > > > command: > > > > > > dd if=/dev/acd0a of=cdimage > > > > > > But it didn't work. I received a message saying "acd0a - Invalid > > > Argument". > > > > > > Next, I tried something different, namely: > > > > > > cat /dev/acd0a | dd of=cdimage > > > > > > and that did work! Any clues why my first attempt (only using dd and not > > > cat) failed? > > > > You should use /dev/acd0c - the 'c' partition means the whole disk. CD's > > don't have the concept of partitions, so there are no {a,b,...} partitions. > > Why the second attempt worked is a mystery to me... > > Let's make some even bigger mystery out of it: dd if=/dev/acd0c of=cdimage > also fails, again with the "acd0c - Unknown Argument" message. Of course, > the second method still works after replacing acd0a with acd0c... > > I'm running 4.4-Stable (as of last Saturday) here, and I think I remember > that some time in the past I had no such problems with dd. If anyone has > a clue what I'm doing wrong or what's going on here, I'd like to hear > about it! How about trying something like this: dd bs=2048 if=/dev/acd0c of=cdimage.iso it works for me. -- Simon Dick simond@irrelevant.org "Why do I get this urge to go bowling everytime I see Tux?" To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message