Multiple cd burning problems
I have two IDE drives : /dev/hda is a harddisk and
/dev/hdb (/dev/cdrom) is my cd-writer.
I alse have a SCSI harddisk : /dev/sda
My Ubuntu is installed on /dev/sda2.
First, when I try to burn a cd with nautilus-cd-burner
as a normal user, it tells me :
"Reload rewritable or blank media
Please replace the in-drive media by a rewritable or blank media."
But the cd in the cd-writer _is_ blank.
N-c-b keeps telling me that message.
Then, when I try to burn (as a normal user, again) with cdrecord
in command-line with this command :
"cdrecord -v dev=ATAPI:
I get the following:
"cdrecord: Drive does not support TAO recording.
cdrecord: Illegal write mode for this drive."
Trying again with cdrecord, but this time as root, it works ... not
During burning, I see a strange behaviour :
Cdrecord burns 10-15Mbytes, then stop a fraction of second,
the buffer gets empty, the speed decreases,and then it restarts burning.
The results are a low average burning speed and some
buffer underruns (without any bad consequences),
as you can see in this output :
"Average write speed 16.0x
Total of 23 possible drive buffer underruns predicted."
My cd-writer is a 52x.
Weirder : if I burn an iso image placed on my IDE disk,
the burning process is a lot slower, cdrecord
hangs each time a few Mbytes are "burned" (5-6Mbytes)
and the average write speed decreases to reach
I've wondered if this was due to a 2.6.8 kernel problem,
so I installed a 2.6.7 (kernel-
from Ubuntu) ... same problem, but I noticed
a weird message I don't have with 2.6.8 :
"Nov 23 22:43:21 localhost kernel: cdrom: hdb: mrw address space DMA selected
Nov 23 22:43:21 localhost kernel:
Nov 23 22:43:21 localhost kernel: device-mapper: error adding target to table"
The latter is repeated several times.
Because I have a dual-boot Ubuntu/Debian-Sid,
I tried on my Debian (kernel 2.6.7-1-k7, the same as Ubuntu 2.6.7 one).
I have no problem writing an iso (no matter if this iso is placed
on my IDE or SCSI hard disk), it works well and fast.
I still use devfs on my Debian-Sid