Re: how to rescue this backup data

[Joerg Schilling]

Zhang Weiwu <zhangwe...@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

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