From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1NB8s3-0000Gi-6E for garchives@archives.gentoo.org; Thu, 19 Nov 2009 15:24:31 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id D0670E0936; Thu, 19 Nov 2009 15:23:40 +0000 (UTC) Received: from emailteste.ufop.br (emailteste.ufop.br [200.131.208.186]) by pigeon.gentoo.org (Postfix) with ESMTP id 76E01E094A for ; Thu, 19 Nov 2009 15:23:38 +0000 (UTC) Received: (qmail 21505 invoked by uid 89); 19 Nov 2009 12:17:09 -0000 Received: by simscan 1.3.1 ppid: 21489, pid: 21502, t: 0.0193s scanners: attach: 1.3.1 clamav: 0.91.2/m:/d:4015 Received: from unknown (HELO malaquias.no-ip.info) (romildo@iceb.ufop.br@200.131.25.75) by 0 with ESMTPA; 19 Nov 2009 12:17:09 -0000 Received: by malaquias.no-ip.info (Postfix, from userid 500) id 0C8DD19668B; Thu, 19 Nov 2009 10:19:00 -0200 (BRST) Date: Thu, 19 Nov 2009 10:18:59 -0200 From: =?iso-8859-1?Q?Jos=E9?= Romildo Malaquias To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] Re: Reading a DVD as an ISO image Message-ID: <20091119121859.GA18585@malaquias.DHCP-GERAL> References: <20091117062411.GA16698@malaquias.DHCP-GERAL> <4B02CC0C.6000600@cox.net> <20091118104845.GD13353@malaquias.DHCP-GERAL> <58965d8a0911180736o2745aee2yf46af8ac3f78d9e6@mail.gmail.com> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <58965d8a0911180736o2745aee2yf46af8ac3f78d9e6@mail.gmail.com> User-Agent: Mutt/1.5.20 (2009-06-14) Content-Transfer-Encoding: quoted-printable X-Archives-Salt: 2f27e9a8-d397-4a43-81d3-702a0dd7c9b2 X-Archives-Hash: 2841fc023395452be79845d2ef531bb4 On Wed, Nov 18, 2009 at 09:36:03AM -0600, Paul Hartman wrote: > 2009/11/18 Jos=E9 Romildo Malaquias : > > On Tue, Nov 17, 2009 at 04:54:20PM +0000, Grant Edwards wrote: > >> On 2009-11-17, Marcus Wanner wrote: > >> > >> > My guess is that he has a slow internet connection, he > >> > downloaded a large iso, burned it, deleted it, and now wants > >> > to get the iso back without downloading it again, but he has > >> > access to the checksum/filesize of the original iso from the > >> > place he downloaded it, and when he makes an iso, the > >> > checksum/filesize does not match. > >> > >> In my experience that happens because one or the other of the > >> images has "extra" garbage blocks past the end of the actual > >> ISO filesystem image. If you look at the ISO filesystem header > >> and find the actual size of the image, it's probably smaller > >> than the "image file". If you only compare the bytes within > >> the ISO image itself, I bet the two will match. > > > > In fact the size of the iso images obtained with dd and with cdread a= re > > a little bit larger than the original one. The iso image obtained by > > mkisofs on the mounted disc (with the udf filesystem type) are of the > > right size, but still not identical to the original. >=20 > This webpage has some info about comaring ISO images to burnt discs > and a possible solution: > http://twiki.org/cgi-bin/view/Wikilearn/CdromMd5sumsAfterBurning Thanks for the link. As I know the size and the sha1sum of the original ISO image, I succeeded in creating an identical ISO image from the dvd disc with the command: dd if=3D/dev/dvd | head -c 4610877440 > /var/tmp/image2.iso Is it possible to do something similar using readcd instead of dd? Romildo