Re: how to rescue this backup data
Zhang Weiwu <zhangweiwu@realss.com> wrote:
> Hello. We have a website backup that has to be recovered thanks to
> webserver hard disk crash. However the person who burned the backup seems
> to have done it wrong. This is what we investigated what most likely
> have happened:
>
> a. he have a DVD+R that has a session on it.
> b. he created a backup iso image by merging that session:
> $ genisoimage -C ... -M /dev/sr0 -o backup.iso website_backup/
> c. he burnt the backup to a /different/ DVD+R that also had a session:
> $ wodim dev=/dev/sr1 backup.iso
> (or, might also have been "$ growisofs -M /dev/sr1=backup.iso" )
> d. he happily labeled the DVD+R in /dev/sr1 as "website backup". no
> double check. done.
1)
wodim does not support to write DVDs (in special DVD+). This is bad in special
as it claims that it includes DVD support.
2)
If you have "wodim" on your system, there is a big chance that you used
"genisoimage" (part of the fork) instead of the original software "mkisofs".
Genisoimage is known to have many bugs that in special hit you in multi-session
mode.
Jörg
--
EMail:joerg@schily.isdn.cs.tu-berlin.de (home) Jörg Schilling D-13353 Berlin
js@cs.tu-berlin.de (uni)
joerg.schilling@fokus.fraunhofer.de (work) Blog: http://schily.blogspot.com/
URL: http://cdrecord.berlios.de/private/ ftp://ftp.berlios.de/pub/schily
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