k3b not working

System
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K3b Version: 1.0.3

KDE Version: 3.5.5
QT Version:  3.3.8
Kernel:      2.6.18-gentoo-r6
Devices
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_NEC DVD+-RW ND-6500A 202C (/dev/hdc, ) [CD-R, CD-RW, CD-ROM, DVD-ROM, DVD-R, DVD-RW, DVD+R, DVD+RW, DVD+R DL] [DVD-ROM, DVD-R Sequential, 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]

Burned media
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DVD-RW Restricted Overwrite

Used versions
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growisofs: 7.0

growisofs
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Executing 'builtin_dd if=/dev/fd/0 of=/dev/hdc obs=32k seek=0'
/dev/hdc: "Current Write Speed" is 1.0x1352KBps.
:-[ WRITE@LBA=0h failed with SK=5h/ASC=30h/ACQ=05h]: Wrong medium type
:-( media is not formatted or unsupported.
:-( write failed: Wrong medium type

growisofs command:
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/usr/bin/growisofs -Z /dev/hdc=/dev/fd/0 -use-the-force-luke=notray -use-the-force-luke=tty -use-the-force-luke=tracksize:494600 -dvd-compat -speed=1 -overburn -use-the-force-luke=bufsize:32m