Overburned DVD data recovery

Andrew P. infofarmer at gmail.com
Tue Oct 11 02:34:50 PDT 2005

On 10/11/05, mrideout at windserve.com <mrideout at windserve.com> wrote:
> Hi,
> I have a cron job that backs up a FreeBSD server's files to DVD+RW media
> each evening using growisofs from the dvd+rw-tools port. There are some
> files that I need to recover, but the problem is, the last 2 weeks of
> backups were a few hundred megabytes too large, and overburned.
> Is there any way to recover data from these overburned DVDs? I tried
> mounting them from FreeBSD, Windows and Mac systems without success. I
> also tried running "cat /dev/acd0 | gzip > data.iso.gz" in an attempt to
> grab the raw bits of the disk, but that only resulted in an input/output
> error.
> Restoring a 2-week-old backup is an option, but any ideas on how I might
> read data off of these overburned disks would be greatly appreciated.
> Thanks,
> Matt
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I'd start with trying to dd the DVD to an ordinary file
(dd if=/dev/dvd-device of=/usr/recov.iso bs=2048)
and then trying to mount that file.

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