> 
> Thanks for your hint. If I don't use devfs I don't have this
behaviour, my
> CD-R is always available.
> 
> { Also, you can possibly find valuable information in the logs
> { (/var/log/syslog, /var/log/messages, etc).
> 
> Looking at the logs and looking the output of lsmod, I see that the
> ide-scsi module gets unloaded by, I guess, the /sbin/modprobe -rs that
> execute every 10 minutes. In my syslog I have the following line:
> 
> Sep  7 16:00:00 maniwaki CROND[8179]: (root) CMD (   /sbin/modprobe
-rs)
> Sep  7 16:00:00 maniwaki kernel: scsi : 0 hosts left.
> 
> Like I said before, it only happens with devfs.
> 

Then I think I know what happens. When ide-scsi is unloaded, device
nodes are destroyed. They should be recreated on acess, but are not. It
means, that cdrecord is using some device nodes that are not listed in
/dev/modules.devfs

Could you please remove ide-scsi and then run

strace -f cdrecord -scanbus

(you may want -o /tmp/log option for strace as well)

this will show what nodes it tried to access.

I'll check it today or tomorrow as well.

-andrej

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