Hello
I have sata pioneer dvr-212 burner and I'm not able to burn multisession disk.

On the list of available modes there is no "TAO" mode:
"Supported modes: PACKET SAO LAYER_JUMP"

Image is burn always with sao mode (even with -tao switch):
"Starting to write CD/DVD/BD at speed 4 in real SAO mode for multi session."

...and disk is closed
-data switch does not help.

It uses default driver:
"Using generic SCSI-3/mmc-3 DVD+RW driver (mmc_dvdplusrw)"

The same problem with DVD+RW and DVD+R

Under ms windows multisession disks are written without problems.

Anybody can help with this?

best regards

I have the dvr-212. Two of them in fact. I've never tried to create a multi-session disk with them, but the last few times I tried writing video discs with k3b, it always errored out in the last few seconds of the burn, creating a disc that didn't play quite right. It's been a few months since I last risked a blank disk in them though, so I don't know if it's still doing it. (I've been using my other system to do all of my burns since this started.)

But it makes me think that perhaps there's a driver bug causing both of our problems.

Does it use wodim or cdrecord?
When I tried wodim from ubuntu repository all disks were not readable after burning. Cdrecord works much better but not enough good

Another problem - it is impossible to set burning speed above 4x.

I'm on Debian, so it's certainly wodim, but truthfully I don't remember the exact settings I tried. It's been a long time since I risked any disks in it. All I know for sure is that I had problems getting disks to close out properly using the same drives you did, but no problems at all on a similar system with different drives.

I've asked cdrecord author.
He answered, that a way to create multisession disks is to use DVD-R[W] instead of DVD+R[W]. I didn't check it yet but I've tried growisofs tool.
It definitely can do it with DVD+R[W] disks

Please quote me correctly......

DVD+RW definitely cannot do multi-border.
The multi-border status for DVD+R is unknown.

The fact that growisofs creates the illusion that there is such support does not
prove anything. For DVD+RW it is known that growisofs uses a hack. As this
hack makes it impossible to access the older "sessioons", it is not an option
for cdrecord. For DVD+R, it is unclear whether it supports multi-border and
I asked you to give information on how DVD+R might work....

Cdrecord is not a simple program like growisofs as cdrecord supports a lot of different
mediy types and a lot of different and highliy complex write modes, it is not simple
to add new features that do not fit into the current scheme. If you don't believe, check
that cdrecord is aprox. 8x bigger than growisofs although cdrecord reuses code wherever
possible.

If you like to use multi-border with DVDs, I still recommend to use DVD- media
as this is even typically more compatible with different drives.

Ok, I'm not an expert and talk only about effects I can see
I'll take into consideration that growisofs uses a hack. I'm going to check if created disk is readable on another drives.
I wouldn't like to throw out a box of 100 new disks