[gentoo] problema cdrecord-prodvd-2.01.01-r1

[fbcyborg]

Ho installato anche il pacchetto cdrecord-prodvd-2.01.01-r1 sulla mia gentoo per amd64, ma nonostante ciò non riesco a cancellare un dvd riscrivibile...
l'errore è:

Device seems to be: Generic mmc2 DVD-R/DVD-RW.
cdrecord: Found DVD+ media but DVD+R/DVD+RW support code is missing.
cdrecord: If you need DVD+R/DVD+RW support, ask the Author for cdrecord-ProDVD.
cdrecord: Free test versions and free keys for personal use are at ftp://ftp.berlios.de/pub/cdrecord/ProDVD/
cdrecord: Sorry, no CD/DVD-Recorder or unsupported CD/DVD-Recorder found on this target.
cdrecord: This version of cdrecord does not include DVD-R/DVD-RW support code.
cdrecord: If you need DVD-R/DVD-RW support, ask the Author for cdrecord-ProDVD.
cdrecord: Free test versions and free keys for personal use are at ftp://ftp.berlios.de/pub/cdrecord/ProDVD/
Using generic SCSI-3/mmc   CD-ROM driver (mmc_cd).
Driver flags   : MMC-3 SWABAUDIO BURNFREE
Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R
Starting to write CD/DVD at speed 48 in real BLANK mode for single session.
Last chance to quit, starting real write    8 seconds.
   0 seconds. Operation starts.
This drive or media does not support the 'BLANK media' command
cdrecord: Cannot blank disk, aborting.

perchè non posso cancellare un DVD+RW ?

[fbcyborg]

ho risolto con

growisofs -Z /dev/hdX=/dev/zero

ma non si spiega perchè da k3b non riesco a formattarlo...