Hi,
I cannot use k3b to burn CDs!!
This is the output of "id"
uid=9999(ahmed) gid=100(users) groups=4(adm),20(dialout),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),100(users),106(lpadmin),110(scanner),111(admin)

k3b asked me to use k3bsetup, I used it, but still it couldn't fix the problem!

It only succeeded, after I used 'kdesu k3b'
-----------
This is the output of k3b debugging

System
-----------------------
K3b Version: 0.12.14

KDE Version: 3.5.2
QT Version:  3.3.6
Kernel:      2.6.15-23-686
Devices
-----------------------
MATSHITA DVD-RAM UJ-841S 1.50 (/dev/scd0, /dev/sg1) at /media/cdrom0 [CD-R; CD-RW; CD-ROM; DVD-ROM; DVD-RAM; DVD-R; DVD-RW; DVD-R DL; DVD+R; DVD+RW; DVD+R DL] [DVD-ROM; DVD-R Sequential; DVD-R Dual Layer Sequential; DVD-RAM; DVD-RW Restricted Overwrite; DVD-RW Sequential; DVD+RW; DVD+R; DVD+R Double Layer; CD-ROM; CD-R; CD-RW] [SAO; TAO; Restricted Overwrite]

K3b
-----------------------
Size of filesystem calculated: 87052

Used versions
-----------------------
cdrecord: 2.1.1a01

cdrecord
-----------------------
/usr/bin/X11/cdrecord: Warning: Running on Linux-2.6.15-23-686
/usr/bin/X11/cdrecord: There are unsettled issues with Linux-2.5 and newer.
/usr/bin/X11/cdrecord: If you have unexpected problems, please try Linux-2.4 or Solaris.
scsidev: '1,0,0'
scsibus: 1 target: 0 lun: 0
Error trying to open /dev/sg0 exclusively (Permission denied)... retrying in 1 second.
Error trying to open /dev/sg0 exclusively (Permission denied)... retrying in 1 second.
Error trying to open /dev/sg0 exclusively (Permission denied)... retrying in 1 second.
Error trying to open /dev/sg0 exclusively (Permission denied)... retrying in 1 second.
Error trying to open /dev/sg0 exclusively (Permission denied)... retrying in 1 second.
Error trying to open /dev/sg0 exclusively (Permission denied)... retrying in 1 second.
Error trying to open /dev/sg0 exclusively (Permission denied)... retrying in 1 second.
Error trying to open /dev/sg0 exclusively (Permission denied)... retrying in 1 second.
Error trying to open /dev/sg0 exclusively (Permission denied)... retrying in 1 second.
Error trying to open /dev/sg0 exclusively (Permission denied)... retrying in 1 second.
Cdrecord-Clone 2.01.01a01 (i686-pc-linux-gnu) Copyright (C) 1995-2004 Joerg Schilling
NOTE: this version of cdrecord is an inofficial (modified) release of cdrecord
      and thus may have bugs that are not present in the original version.
      Please send bug reports and support requests to <email address hidden>.
      The original author should not be bothered with problems of this version.
TOC Type: 3 = CD-ROM XA mode 2
/usr/bin/X11/cdrecord: Permission denied. Cannot open '/dev/sg0'. Cannot open SCSI driver.
/usr/bin/X11/cdrecord: For possible targets try 'cdrecord -scanbus'. Make sure you are root.
/usr/bin/X11/cdrecord: For possible transport specifiers try 'cdrecord dev=help'.
/usr/bin/X11/cdrecord: 
/usr/bin/X11/cdrecord: For more information, install the cdrtools-doc
/usr/bin/X11/cdrecord: package and read /usr/share/doc/cdrecord/README.ATAPI.setup .

cdrecord command:
-----------------------
/usr/bin/X11/cdrecord.mmap -v gracetime=2 dev=1,0,0 speed=24 -tao driveropts=burnfree -eject -multi -xa -tsize=87052s - 

mkisofs
-----------------------
87052
INFO: UTF-8 character encoding detected by locale settings.
 Assuming UTF-8 encoded filenames on source filesystem,
 use -input-charset to override.

mkisofs command:
-----------------------
/usr/bin/mkisofs -gui -graft-points -volid K3b data project -volset  -appid K3B THE CD KREATOR (C) 1998-2005 SEBASTIAN TRUEG AND THE K3B TEAM -publisher  -preparer  -sysid LINUX -volset-size 1 -volset-seqno 1 -sort /tmp/kde-ahmed/k3bzuuL2b.tmp -rational-rock -hide-list /tmp/kde-ahmed/k3bnO0dfc.tmp -joliet -hide-joliet-list /tmp/kde-ahmed/k3bUbJO4b.tmp -full-iso9660-filenames -iso-level 2 -path-list /tmp/kde-ahmed/k3bqBlmab.tmp