K3B et CD-RW

Bonsoir à tous !
Voilà,
j'ai un problème avec K3B :
Quand je veux graver sur un CD-R vierge , pas de problème.
Quand je veux graver sur un CD-RW vierge, le CD-RW est rejeté ( ça ne vient pas du CD car j'ai vérifié avec plusieurs et de marques différentes ) et j'ai un message suivant :

Devices
-----------------------
IDE-CD R/RW 8x4x32 1.5 (/dev/hdd, ) at /mnt/cdrom2 [CD-R; CD-RW; CD-ROM] [Erreur] [TAO; RAW; SAO / R16]
TOSHIBA DVD-ROM SD-M1402 1010 (/dev/hdc, ) at /mnt/cdrom [CD-ROM; DVD-ROM] [DVD-ROM; CD-ROM] [Aucune]

System
-----------------------
K3b Version: 0.11.20
KDE Version: 3.3.2
QT Version: 3.3.4
Kernel: 2.6.11-6mdk

cdrecord
-----------------------
/usr/bin/cdrecord: Cannot allocate memory. WARNING: Cannot do mlockall(2).
/usr/bin/cdrecord: WARNING: This causes a high risk for buffer underruns.
/usr/bin/cdrecord: Operation not permitted. WARNING: Cannot set RR-scheduler
/usr/bin/cdrecord: Permission denied. WARNING: Cannot set priority using setpriority().
/usr/bin/cdrecord: WARNING: This causes a high risk for buffer underruns.
scsidev: '/dev/hdd'
devname: '/dev/hdd'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
Linux sg driver version: 3.5.27
SCSI buffer size: 64512
Cdrecord-Clone 2.01.01a01-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: 3 = CD-ROM XA mode 2
Using libscg version 'schily-0.8'.
atapi: 1
Device type : Removable CD-ROM
Version : 0
Response Format: 1
Vendor_info : 'IDE-CD '
Identifikation : 'R/RW 8x4x32 '
Revision : ' 1.5'
Device seems to be: Generic mmc CD-RW.
Using generic SCSI-3/mmc CD-R/CD-RW driver (mmc_cdr).
Driver flags : MMC SWABAUDIO
Supported modes: TAO PACKET RAW/R16
Drive buf size : 1572864 = 1536 KB
FIFO size : 4194304 = 4096 KB
/usr/bin/cdrecord: Operation not permitted. WARNING: Cannot set RR-scheduler
/usr/bin/cdrecord: Permission denied. WARNING: Cannot set priority using setpriority().
/usr/bin/cdrecord: WARNING: This causes a high risk for buffer underruns.
/usr/bin/cdrecord: Write speed 2 of writer not sufficient for this medium.
/usr/bin/cdrecord: You did use a high speed medium on an improper writer or
/usr/bin/cdrecord: you used a speed=# option with a speed too low for this medium.
/usr/bin/cdrecord: fifo had 7 puts and 0 gets.
/usr/bin/cdrecord: fifo was 0 times empty and 0 times full, min fill was 0%.
Track 01: data 0 MB padsize: 226 KB
Total size: 0 MB (00:04.02) = 302 sectors
Lout start: 1 MB (00:06/02) = 302 sectors
Current Secsize: 2048
ATIP info from disk:
Indicated writing power: 2
Reference speed: 6
Is not unrestricted
Is erasable
Disk sub type: High speed Rewritable (CAV) media (1)
ATIP start of lead in: -11077 (97:34/23)
ATIP start of lead out: 359849 (79:59/74)
1T speed low: 4 1T speed high: 10
2T speed low: 2 2T speed high: 10
power mult factor: 2 6
recommended erase/write power: 5
A1 values: 24 2C DC
A2 values: 14 A4 4A
A3 values: 04 C4 80
Disk type: Phase change
Manuf. index: 11
Manufacturer: Mitsubishi Chemical Corporation
Blocks total: 359849 Blocks current: 359849 Blocks remaining: 359547
Speed set to 353 KB/s

cdrecord comand:
-----------------------
/usr/bin/cdrecord -v gracetime=2 dev=/dev/hdd speed=8 -tao -eject -multi -xa -tsize=187s -

mkisofs
-----------------------
187
Total translation table size: 0
Total rockridge attributes bytes: 659
Total directory bytes: 2048
Path table size(bytes): 22
Max brk space used 0
187 extents written (0 MB)

mkisofs comand:
-----------------------
/usr/bin/mkisofs -gui -graft-points -volid K3B ARCHIVES 1 -volset -appid K3B THE CD KREATOR VERSION 0.11.20 (C) 2003 SEBASTIAN TRUEG AND THE K3B TEAM -publisher -preparer K3b - Version 0.11.20 -sysid LINUX -volset-size 1 -volset-seqno 1 -sort /tmp/kde-claude/k3bWxjrFb.tmp -rational-rock -hide-list /tmp/kde-claude/k3brWeUTa.tmp -full-iso9660-filenames -iso-level 2 -path-list /tmp/kde-claude/k3bqTh9Sa.tmp /home/claude/.kde/share/apps/k3b/temp/dummydir0/

Avez-vous idée de ce que ça peut être comme cause ?

Merci pour votre aide,

clame.