[Debburn-devel] Mysterious multisession failure

[Barry Kauler]

Thomas,
Thanks for your further help regarding how xorriso can replace mkisofs
and cdrecord, and I also saw the docs how it can work with growisofs.

It would seem that the cdrkit maintaners have to fix the bug that I
reported. The maintainer of cdrtools emailed me and explained that is
an old bug, fixed in cdrtools. I tested the 2.01.01a61 version of
cdrtools and yes indeed, it worked.

Anyway, I am trying an experiment. I have built the latest
alpha-release of Puppy Linux with xorriso and a cutdown cdrkit. I took
out genisoimage and wodim out of cdrkit as that functionality is now
provided by xorriso. I have set it up so that all scripts and apps
that use mkisofs, cdrecord, growisofs, work as before.

So far I have done basic testing of a "multisession cd" -- Puppy
running from live-cd, running totally in ram and sessions saved back
to the cd -- and it works fine. Haven't tested a dvd yet.

...by the way, that works ok in a PC with as little as 256MB ram. The
Puppy iso is only 92MB and gets copied totally into ram, so the
optical drive becomes free for other uses.

...I can't resist the plug for Puppy, and for Debian fans, a
Debian-Puppy is in alpha, only about 100MB - 110MB and will also work
in the "multisession cd/dvd" mode.

See my blog posts:

Xorriso and cdrkit-cutdown in Puppy:
http://puppylinux.com/blog/?viewDetailed=00896

Puppy Linux 416alpha:
http://puppylinux.com/blog/?viewDetailed=00898

Regards,
Barry Kauler


On 7/17/09, Thomas Schmitt <scdbackup at gmx.net> wrote:
> Hi,
>
>> http://www.puppylinux.com/news/news2005a.htm
>
> Oops. -D is _disable_ relocation.
> I should read man pages more often.
>
>
>> -iso-level 4
>
> According to the man page this is the 1999 version
> of ISO 9660. The question is which operating
> systems are willing to mount this.
> 1999 is an attempt to make ISO 9660 a bit less
> restricted. Nevertheless it falls short in
> comparison to the capabilities of the Rock Ridge
> extensions.
>
>
> Well, since you already had disabled relocation,
> and since it did not work with relocation in 2005,
> i think it is time to try xorriso.
>
> It can emulate most of your mkisofs and cdrecord
> options:
>
>   xorriso -as mkisofs \
>      -R -o cd-puppy.iso -b isolinux.bin -c boot.cat \
>      -no-emul-boot -boot-load-size 4 -boot-info-table ./build/
>
>   xorriso -as cdrecord \
>      -multi -tao -pad -data -eject -v speed=10 dev=/dev/sr0 \
>      cd-puppy.iso
>
>   SECT=`xorriso -as cdrecord -msinfo dev=/dev/sr0 | grep '^[0-9]*.[0-9]'`
>   export SECT
>   xorriso -as mkisofs \
>      -print-size -R -C $SECT -M /dev/sr0 -quiet \
>      -graft-points 2009-07-15=/root/nothing
>
> I would propose padsize=300k rather than -pad
> because the Linux TAO read bug meanwhile easily
> hops over 30 kB of padding.
>
> xorriso can do the jobs by its own options
> and without the need for intermediate .iso
> files on hard disk:
>
>   xorriso -dev /dev/sr0 -blank as_needed \
>           -map ./build / \
>           -boot_image isolinux bin_path=/isolinux.bin \
>           -boot_image isolinux cat_path=/boot.cat \
>           -boot_image isolinux load_size=2048 \
>           -commit_eject all
>
>   xorriso -dev /dev/sr0 \
>           -map /root/nothing /2009-07-15 \
>           -chmod 0755 /2009-07-15 \
>           -print_size
>
>   (resp.  -commit_eject all
>    to actually burn and eject)
>
> Depending on the media type one should give the
> -boot_image options with each session. With
> multi-session media (e.g. CD-R[W] or DVD-R[W]) the
> BIOSes normally do not obey El Torito specs and
> boot via the first session. (The specs say it
> shall be the last one.) The booted OS then normally
> mounts the last session.
>
> On overwriteable media (DVD+RW, DVD-RAM, BD-RE)
> the BIOS and the OS see only one session. This
> session has to be made bootable with every
> new session added by xorriso.
>
>
> Have a nice day :)
>
> Thomas
>
>