Comment 4 for bug 91210

I'm also unable to write DVD (not even dvd+RW if I want to write them til the end). So I turned off X server and kdm and I logged in as root in tty1 ([ctr][alt][F1]) to avoid bug #75753 (cdrom ide drives wrong group https://bugs.launchpad.net/ubuntu/+source/udev/+bug/75753).
So in command line I did

growisofs -Z /dev/scd0=./kubuntu-6.10-dvd-i386.iso

and I had an error msg that is not in the k3b log becouse is a kernel error msg:

Executing 'builtin_dd if=/home/Documents/Software/kubuntu-6.10-dvd-i386.iso of=/dev/scd0 obs=32k seek=0'
/dev/scd0: "Current Write Speed" is 4.1x1352KBps.
    5636096/4221640704 ( 0.1%) @1.1x, remaining 37:24 RBU 97.9% UBU 4.8%
   17072128/4221640704 ( 0.4%) @2.5x, remaining 28:43 RBU 97.4% UBU 76.2%
   28475392/4221640704 ( 0.7%) @2.5x, remaining 24:32 RBU 95.2% UBU 76.2%
   39878656/4221640704 ( 0.9%) @2.5x, remaining 22:43 RBU 91.9% UBU 76.2%
   51281920/4221640704 ( 1.2%) @2.5x, remaining 23:02 RBU 91.0% UBU 76.2%
   62685184/4221640704 ( 1.5%) @2.5x, remaining 22:06 RBU 87.7% UBU 76.2%
   74121216/4221640704 ( 1.8%) @2.5x, remaining 21:26 RBU 85.9% UBU 76.2%
   85491712/4221640704 ( 2.0%) @2.5x, remaining 21:46 RBU 84.8% UBU 76.2%
   96894976/4221640704 ( 2.3%) @2.5x, remaining 21:17 RBU 82.8% UBU 76.2%
  108298240/4221640704 ( 2.6%) @2.5x, remaining 21:31 RBU 81.0% UBU 76.2%
.
.
.
.
  290062336/4221640704 ( 6.9%) @2.5x, remaining 19:39 RBU 54.2% UBU 76.2%
  301465600/4221640704 ( 7.1%) @2.5x, remaining 19:30 RBU 52.8% UBU 76.2%
  312803328/4221640704 ( 7.4%) @2.5x, remaining 19:34 RBU 48.9% UBU 76.2% _
[ 2618.968000] ata1.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen | These two msgs lines aren't std output msgs => are not
[ 2618.968000] ata1.01: cmd a0/01:00:00:00:00/00:00:00:00:00/b0 tag 0 cdb 0x2a data 32768 out _| present in the k3b logfile
:-[ WRITE@LBA=26200h failed with SK=7h/ASC=00h/ACQ=01h]: Input/output error
:-( write failed: Input/output error
/dev/scd0: flushing cache
/dev/scd0: stopping de-icing
/dev/scd0: writing lead-out

I dont have SATA drives but as far as I understand in kernel 2.6.20 there is no /dev/hdx, all ide and sata drives are scsi type drives (http://beranger.org/index.php?article=2696). I atached my lspci -vvn. I have IDE hd and IDE dvdrw, but with this kernel 2.6.20-13, my hd is /dev/sda and my dvd is /dev/scd.
The funy thing is if I do
growisofs -Z /dev/scd0=/dev/zero
Everything goeas fine!. Look:

WARNING: /dev/scd0 already carries isofs!
About to execute 'builtin_dd if=/dev/zero of=/dev/scd0 obs=32k seek=0'
/dev/scd0: "Current Write Speed" is 4.1x1352KBps.
     655360/4700372992 ( 0.0%) @0.1x, remaining 717:07 RBU 100.0% UBU 4.8%
    7569408/4700372992 ( 0.2%) @1.5x, remaining 92:59 RBU 100.0% UBU 76.2%
   18939904/4700372992 ( 0.4%) @2.5x, remaining 53:33 RBU 100.0% UBU 76.2%
   30343168/4700372992 ( 0.6%) @2.5x, remaining 41:02 RBU 100.0% UBU 76.2%
   41746432/4700372992 ( 0.9%) @2.5x, remaining 35:20 RBU 100.0% UBU 76.2%
   53084160/4700372992 ( 1.1%) @2.5x, remaining 33:33 RBU 100.0% UBU 76.2%
   64487424/4700372992 ( 1.4%) @2.5x, remaining 31:09 RBU 100.0% UBU 76.2%
   75890688/4700372992 ( 1.6%) @2.5x, remaining 29:27 RBU 100.0% UBU 76.2%
   87261184/4700372992 ( 1.9%) @2.5x, remaining 29:04 RBU 100.0% UBU 76.2%
.
.
.
 4606394368/4700372992 (98.0%) @4.1x, remaining 0:18 RBU 100.0% UBU 76.2%
 4625301504/4700372992 (98.4%) @4.1x, remaining 0:14 RBU 100.0% UBU 76.2%
 4644241408/4700372992 (98.8%) @4.1x, remaining 0:10 RBU 100.0% UBU 76.2%
 4663214080/4700372992 (99.2%) @4.1x, remaining 0:07 RBU 100.0% UBU 76.2%
 4682285056/4700372992 (99.6%) @4.1x, remaining 0:03 RBU 100.0% UBU 76.2%
 4700372992/4700372992 (100.0%) @3.9x, remaining 0:00 RBU 100.0% UBU 76.2%
:-[ WRITE@LBA=230540h failed with SK=5h/ASC=21h/ACQ=00h]: No space left on device
:-( write failed: No space left on device
/dev/scd0: flushing cache
/dev/scd0: stopping de-icing
/dev/scd0: writing lead-out

So it seems to me that there is a problem on the scsi emulation layer when dealing with two ide devices, or a problem with the scsi drive module dealing with more than one device at a time... ( ?! )
Do you have the same behaviour?.

If you run growisofs in tty1 shuting down X, do you have this kernel msg?

Thanks!!