From owner-freebsd-questions@FreeBSD.ORG Fri Jan 16 10:52:45 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A300816A4CE for ; Fri, 16 Jan 2004 10:52:45 -0800 (PST) Received: from sccrmhc11.comcast.net (sccrmhc11.comcast.net [204.127.202.55]) by mx1.FreeBSD.org (Postfix) with ESMTP id B6EBA43D55 for ; Fri, 16 Jan 2004 10:51:38 -0800 (PST) (envelope-from freebsd-questions-local@be-well.ilk.org) Received: from be-well.no-ip.com ([66.30.196.44]) by comcast.net (sccrmhc11) with ESMTP id <2004011618513701100jd1q4e>; Fri, 16 Jan 2004 18:51:37 +0000 Received: by be-well.no-ip.com (Postfix, from userid 1147) id 3ACFEF; Fri, 16 Jan 2004 13:51:37 -0500 (EST) Sender: lowell@be-well.ilk.org To: dcswest@despammed.com References: <40071c65.1e4.1634.30923@flashmail.com> From: Lowell Gilbert Date: 16 Jan 2004 13:51:37 -0500 In-Reply-To: <40071c65.1e4.1634.30923@flashmail.com> Message-ID: <44fzef916u.fsf@be-well.ilk.org> Lines: 34 User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii cc: freebsd-questions@FreeBSD.org Subject: Re: possibly lost data by "Burning Raw Data CDs" X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: freebsd-questions@FreeBSD.org List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Jan 2004 18:52:45 -0000 "dcswest@flashmail.com" writes: > Was running FreeBSD 5.1 Release on a Dell Inspiron 8500 with > a CD-RW/DVD Combo drive and "backed up" data onto several > new CD-RWs simply as follows: > > burncd -s max data archive.tar.gz > > Then after installing FreeBSD 5.2 Release, tried restoring > as follows: > > tar -xvzf /dev/acd0 > > And unfortunately ended up with only error messages such as > input/output, unexpected end of archive/file and child > returned status 2 from all the CD-RWs too. The block size on a CD is 2048. You need to tell that to tar. I think you can do it with the -b option. Fixating would definitely be a good idea, in any case; I'm not sure it's necessary, but I would expect it to be. > Not sure if it has anything to do with not blanking or > erasing the new CD-RWs first or not adding "fixate" to the > "burncd" command, but planning to always now just burn and > thoroughly test ISOs for even one file, and only desperately > seeking to first recover this data any which way. dd if=/dev/acd0c of=archive.tar.gz bs=2048 You shouldn't need to do that, but it won't really hurt either, aside from a small space wastage. Whatever you do, though, TEST YOUR BACKUPS BEFORE YOU NEED THEM.