[Debburn-devel] Genisomage md5 mismatch

[Christophe Huriaux]

2012/4/6 Jos Vlaar <vlaarjos at gmail.com>:
> Hey guys,
>
> I've copied a dvd-video folder several times and generated an iso image out
> of it with genisoimage, but none of the output images have the same md5sum
> allthough I verified with md5deep that the trees I copied over were exactly
> the same. But in 2 different runs of genisoimage -o - dvd-video, I haven't
> seen the same file (md5 match) output for about 8 tries. Does genisoimage
> put date (completed) information in the file or something? I also tried
> putting the output files of the same dvd-trees on a different drive, but it
> had the same effect. Is this a bug?
>

  It's not a bug, it's a feature : the ISO9660 file-system contains
the volume creation date & time as well as the recording date & time
for each extent (files and directories). This is why you cannot obtain
two binary identical ISO files from the same source. :-)

Regards,
Christophe Huriaux