[FC5] Unable to blank CD-RW

[Antonio Montagnani]

Suddenly I am not able to blank any CD-RW with KB3.
I get the following report:

System
-----------------------
K3b Version: 0.12.15

KDE Version: 3.5.4-0.1.fc5 Fedora-Core
QT Version:  3.3.6
Kernel:      2.6.17-1.2174_FC5
Devices
-----------------------
QSI CDRW/DVD SBW242U UU30 (/dev/hdc, ) at  [CD-R; CD-RW; CD-ROM;
DVD-ROM] [DVD-ROM; CD-ROM; CD-R; CD-RW] [SAO; TAO; RAW; SAO/R96P;
SAO/R96R; RAW/R16; RAW/R96P; RAW/R96R]

Used versions
-----------------------
cdrecord: 2.1.1a03

cdrecord command:
-----------------------
/usr/bin/cdrecord -v gracetime=2 dev=/dev/hdc speed=24 -tao
driveropts=burnfree -eject blank=fast -force

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/hdc'
devname: '/dev/hdc'
scsibus: -2 target: -2 lun: -2
Error trying to open /dev/hdc exclusively ... retrying in 1 second.
Error trying to open /dev/hdc exclusively ... retrying in 1 second.
Error trying to open /dev/hdc exclusively ... retrying in 1 second.
Error trying to open /dev/hdc exclusively ... retrying in 1 second.
Error trying to open /dev/hdc exclusively ... retrying in 1 second.
Error trying to open /dev/hdc exclusively ... retrying in 1 second.
Error trying to open /dev/hdc exclusively ... retrying in 1 second.
Error trying to open /dev/hdc exclusively ... retrying in 1 second.
Error trying to open /dev/hdc exclusively ... retrying in 1 second.
Error trying to open /dev/hdc exclusively ... retrying in 1 second.
/usr/bin/cdrecord: Device or resource busy. Cannot open '/dev/hdc'.
Cannot open SCSI driver.
/usr/bin/cdrecord: For possible targets try 'cdrecord -scanbus'. Make
sure you are root.
/usr/bin/cdrecord: For possible transport specifiers try 'cdrecord dev=help'.
Cdrecord-Clone 2.01.01a03-dvd (i686-pc-linux-gnu) Copyright (C)
1995-2005 Jörg 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.
TOC Type: 1 = CD-ROM

What shall I do??

-- 
Antonio Montagnani
Skype : antoniomontag