Can't format cd-rw

[Hugo Vázquez]

If I try to format/erase a CD-RW I get the error code 255 from cdrecord

Devices
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HL-DT-ST DVDRAM GH22LS50 TL03 (/dev/sr0, CD-R, CD-RW, CD-ROM, DVD-ROM, 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-R Dual Layer Jump, DVD-RAM, DVD-RW Restricted Overwrite, DVD-RW Sequential, DVD+RW, DVD+R, DVD+R Dual Layer, CD-ROM, CD-R, CD-RW] [SAO, TAO, RAW, SAO/R96P, SAO/R96R, RAW/R16, RAW/R96P, RAW/R96R, Restricted Overwrite, Layer Jump] [%7]
ATAPI iHAS324 Y BL1W (/dev/sr1, CD-R, CD-RW, CD-ROM, DVD-ROM, 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-R Dual Layer Jump, DVD-RAM, DVD-RW Restricted Overwrite, DVD-RW Sequential, DVD+RW, DVD+R, DVD+R Dual Layer, CD-ROM, CD-R, CD-RW] [SAO, TAO, RAW, SAO/R96R, RAW/R16, RAW/R96P, RAW/R96R, Restricted Overwrite, Layer Jump] [%7]

System
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K3b Version: 1.91.0
KDE Version: 4.4.5 (KDE 4.4.5)
QT Version: 4.6.2
Kernel: 2.6.32-37-generic

Used versions
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cdrecord: 1.1.10

cdrecord
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scsidev: '/dev/sr1'
devname: '/dev/sr1'
scsibus: -2 target: -2 lun: -2
Error trying to open /dev/sr1 exclusively (Device or resource busy)... retrying in 1 second.
=== last message repeated 4 times. ===
Error trying to open /dev/sr1 exclusively (Device or resource busy)... giving up.
WARNING: /dev/sr1 seems to be mounted!
/usr/bin/wodim: Device or resource busy.
Cannot open SCSI driver!
For possible targets try 'wodim --devices' or 'wodim -scanbus'.
For possible transport specifiers try 'wodim dev=help'.
For IDE/ATAPI devices configuration, see the file README.ATAPI.setup from
the wodim documentation.
TOC Type: 1 = CD-ROM

cdrecord command:
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/usr/bin/wodim -v gracetime=2 dev=/dev/sr1 speed=4 -tao driveropts=burnfree -force blank=fast