Re: Multisession DVD creation problem.

[Γιώργος Κωστόπουλος <giorgosk67 gmail com>]

Στις Παρ, 4 Ιαν 2019 στις 1:42 μ.μ., ο/η Thomas Schmitt
<scdbackup gmx net> έγραψε:
> Hi,
>
> i am not a Brasero user but backend programmer of libburn.
>
>   
> https://doc.opensuse.org/documentation/leap/gnomeuser/html/book.gnomeuser/cha.gnome.burn.html#sec.brasero.multisession
> only describes how to start a multi-session medium.
>
> This seems to imply that adding another session needs no special user
> interaction. The filesystem tree of the previous session must be loaded
> and should be displayed by Brasero.
>
> Putting an appendable DVD+R into /dev/sr4 and starting Brasero 3.11.4
> offers me "Data project" and then a white screen with the advise to
> "Add" or "Remove" files.
> A footer line says "Blank DVD-RW Disc: 2.7 GB of free space" (which is
> wrong in respect to type and state but not in respect to size).
>
> In the top line i see a drive-and-CD icon with move-over text
> "Import Data DVD+R".
> I click and get to see the file list of the root directory of the
> ISO 9660 filesystem on the DVD+R.
>
> Did not go further in order not to alter my test DVD+R.
>
> ---------------------------------------------------------------------------
>
> I would expect that Brasero can do multi-session on DVD-R, DVD+R, and
> unformatted DVD-RW.
> On DVD-RAM, DVD+RW, formatted DVD-RW it depends on how much it knows about
> the growisofs-style emulation of multisession with ISO 9660 filesystems.
>
> With DVD+RW my Brasero imports the existing ISO 9660 tree and lets
> me add a directory. But when i click "Burn ..." i get asked whether i
> want to blank the the medium (or replace it or cancel). If i agree to
> blanking, i only get burned my newly added directory over the existing
> filesystem.
>
> I.e. the old directory trees are gone !
>
> The only warning was the question whether i want to blank the DVD+RW.
> No refusal was to see when i composed the filesystem with old and new
> directory trees.
>
> Well, maybe your version is smarter.
>
> ---------------------------------------------------------------------------
>
> You may inspect the medium state whether it is usable for appending sessions
> by this shell command:
>
>   xorriso -outdev /dev/sr0 -toc
>
> If the medium is appendable, then you will see among other messages:
>
>   Media current: DVD+R
>   Media product: CMC_MAG/M01/48 , CMC Magnetics Corporation
>   Media status : is written , is appendable
>   Media blocks : 950976 readable , 1342080 writable , 2295104 overall
>   TOC layout   : Idx ,  sbsector ,       Size , Volume Id
>   ISO session  :   1 ,         0 ,    950976s , d-live 9.3.0 xf amd64
>   Media summary: 1 session, 950976 data blocks, 1857m data, 2621m free
>   Media nwa    : 953024s
>
> Important is "appendable" in contrast to "closed" or "blank". The line
> "media nwa" will only appear with appendable media (next writable address).
> The numbers like "950976", "1857m" will probably differ with your medium.
> (From your report i conclude that not more than 1 session is on the DVD.)
>
> A DVD+RW with ISO 9660 filesystem will also be classified by xorriso
> as appendable. (And of course it will not accidentially overwrite the
> existing data when appending a new session.)

THANKS Thomas for your help!!! :-)
Xorriso returns: "Media status : is written , is appendable".

I didn't know about Xorriso, so let me test it again (with a new dvd)
and I'll be back.
> Have a nice day :)
>
> Thomas
Best wishes for the new year!!! :-)
Giorgos.