Arjan van de Ven escreveu:
(althought I cannot have access do /dev/sr0). But the device is not
reconned by sg.ko (is is not registered).

The first consequence of this behaviour is that I cannot record
anything using the unity.
    

why would you need sg.ko for recording ?
just use /dev/scd0 directly
(eg cdrecord --dev=/dev/scd0 .....)

  
That's what I get...

[root@200-207-17-55 TRACKS]# cdrecord --dev=/dev/scd0 speed=4 -raw16 -overburn -v *cd1*
Cdrecord-Clone 2.01a27-dvd (i686-pc-linux-gnu) Copyright (C) 1995-2004 Jörg Schilling
Note: This version is an unofficial (modified) version with DVD support
Note: and therefore may have bugs that are not present in the original.
Note: Please send bug reports or support requests to <warly@mandrakesoft.com>.
Note: The author of cdrecord should not be bothered with problems in this version.
TOC Type: 1 = CD-ROM
scsidev: '/dev/scd0'
devname: '/dev/scd0'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
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-1.80-RH '@(#)scsi-linux-sg.c        1.80 04/03/08 Copyright 1997 J. Schilling').
SCSI buffer size: 0
cdrecord: Invalid argument. Cannot get SCSI I/O buffer.