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Re: burn cd/dvd: permission /dev/sg0 denied



On Fri, Jul 22, 2005 at 02:47:19PM +0000, antonio giulio wrote:
> I'm trying to burn a backup dvd of partition or single file in cd, but
> I got permission /dev/sg0 denied.
> 
> ls -l /dev/sg0
> crw-------  1 root root 21, 0 2005-06-02 23:22 /dev/sg0
> It seems right permissions...
> 
> cdrecord --scanbus returns:
> ........ various notes
> cdrecord: Warning: Running on Linux-2.6.11-9-amd64-k8
> cdrecord: There are unsettled issues with Linux-2.5 and newer.
> cdrecord: If you have unexpected problems, please try Linux-2.4 or Solaris.
> cdrecord: No such file or directory. Cannot open '/dev/pg*'. Cannot
> open SCSI driver.
> cdrecord: For possible targets try 'cdrecord -scanbus'.
> cdrecord: For possible transport specifiers try 'cdrecord dev=help'.
> cdrecord:
> cdrecord: For more information, install the cdrtools-doc
> cdrecord: package and read /usr/share/doc/cdrecord/README.ATAPI.setup .
> 
> cdrecord dev=help returns:
> cdrecord: Warning: Running on Linux-2.6.11-9-amd64-k8
> cdrecord: There are unsettled issues with Linux-2.5 and newer.
> cdrecord: If you have unexpected problems, please try Linux-2.4 or Solaris.
> Supported SCSI transports for this platform:
> 
> Transport name:         sg
> Transport descr.:       Generic transport independent SCSI
> Transp. layer ind.:
> Target specifier:       bus,target,lun
> Target example:         1,2,0
> SCSI Bus scanning:      supported
> Open via UNIX device:   not supported
> 
> Transport name:         pg
> Transport descr.:       SCSI transport for ATAPI over Parallel Port
> Transp. layer ind.:
> Target specifier:       bus,target,lun
> Target example:         1,2,0
> SCSI Bus scanning:      supported
> Open via UNIX device:   not supported
> 
> ecc.
> 
> Have you any idea? I have not changed kernel. Maybe a udev update in
> these last days for 'unstable' debian tree?

Well from what I have read, the udev update in unstable right now, does
NOT work with kernels less than 2.6.12 in some ways.  I don't know
exactly what it breaks, but it breaks somethings.  On the other hand
without the new udev apparently 2.6.12 and above don't work.  Rather
unfortunate if you can't go back to a previous kernel once you upgrade.
Seems like a big mistake on the part of udev and/or the kernel
maintainers.

I haven't actually used scsi burners for quite a long time, so I
heaven't had to deal with sg for a while.  Everything works perfectly
for me under 2.6.11 with the old udev (or no udev at all in many cases)
using just the ide-cd interface.  I have mostly been burning dvds though
using growisofs, so cdrecord could be broken for all I know.

Len Sorensen



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