cdrao & permissions

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I'm running cdrao on a Lenovo R51
(http://www.charlescurley.com/Lenovo.R51.html), with gcdmaster as a
GUI front end. I can read and writes CDs as root but not as a regular
user. This suggests a permissions/ownership issue. The command line
is:

cdrdao write --remote 24 -v0 --device ATA:1,0,0 --driver generic-mmc:0x0 --buffers 10 /tmp/gcdm.toc.MqsSU0

When I run that as my user, I get:

--------------------------------------------------
cdrdao: Operation not permitted. Cannot send SCSI cmd via ioctl
--------------------------------------------------

The physical device is /dev/hdc, and as my user, K3B can read and
write it just fine.

cdrecord reports:

--------------------------------------------------
[root@dragon ~]# cdrecord -scanbus
Cdrecord-Clone 2.01.01a03-dvd (i686-pc-linux-gnu) Copyright (C) 1995-2005 J�rg Schilling
NOTE: This version contains the OSS DVD extensions for cdrtools and thus may
      have bugs related to DVD issues that are not present in the original
      cdrtools. Please send bug reports or support requests to
      http://bugzilla.redhat.com/bugzilla The original cdrtools author should
      not be bothered with problems in this version.
scsidev: 'ATA'
devname: 'ATA'
scsibus: -2 target: -2 lun: -2
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.8'.
cdrecord: Warning: using inofficial libscg transport code version (schily - Red Hat-scsi-linux-sg.c-1.85-RH '@(#)scsi-linux-sg.c     1.85 05/05/16 Copyright 1997 J. Schilling').
scsibus1:
        1,0,0   100) 'HL-DT-ST' 'RW/DVD GCC-4241N' '1.04' Removable CD-ROM
        1,1,0   101) *
        1,2,0   102) *
        1,3,0   103) *
        1,4,0   104) *
        1,5,0   105) *
        1,6,0   106) *
        1,7,0   107) *
--------------------------------------------------

Question: what device file does that point to?

-- 

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