Date: 16 Jan 2004 13:51:37 -0500 From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org> To: dcswest@despammed.com Cc: freebsd-questions@FreeBSD.org Subject: Re: possibly lost data by "Burning Raw Data CDs" Message-ID: <44fzef916u.fsf@be-well.ilk.org> In-Reply-To: <40071c65.1e4.1634.30923@flashmail.com> References: <40071c65.1e4.1634.30923@flashmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
"dcswest@flashmail.com" <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.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?44fzef916u.fsf>