Cdrecord: Unable to burn DVD

Problem

I want to burn a DVD with cdrecord, but it gives me this error:

$> sudo cdrecord -scanbus
Cdrecord-Clone 2.01.01a01 (i686-pc-linux-gnu) Copyright (C) 1995-2004 J�rg Schilling
NOTE: this version of cdrecord is an inofficial (modified) release of cdrecord
      and thus may have bugs that are not present in the original version.
      Please send bug reports and support requests to <cdrtools@packages.debian.org>.
      The original author should not be bothered with problems of this version.

Environment

Debian 3.1
sudo cdrecord -scanbus

Cdrecord-Clone 2.01.01a01 (i686-pc-linux-gnu) Copyright (C) 1995-2004 J�rg Schilling
NOTE: this version of cdrecord is an inofficial (modified) release of cdrecord
      and thus may have bugs that are not present in the original version.
      Please send bug reports and support requests to <cdrtools@packages.debian.org>.
      The original author should not be bothered with problems of this version.

Linux sg driver version: 3.1.25
Using libscg version 'schily-0.8'.
scsibus0:
        0,0,0     0) 'DVDRW   ' '16X16           ' 'PTS2' Removable CD-ROM
        0,1,0     1) 'SONY    ' 'CD-RW  CRX100E  ' '1.0j' Removable CD-ROM
        0,2,0     2) *
        0,3,0     3) *
        0,4,0     4) *
        0,5,0     5) *
        0,6,0     6) *
        0,7,0     7) *
scsibus1:
        1,0,0   100) '' '' '' Removable not present Disk
        1,1,0   101) *
        1,2,0   102) *
        1,3,0   103) *
        1,4,0   104) *
        1,5,0   105) *
        1,6,0   106) *
        1,7,0   107) *

Journal

20070504

/usr/share/doc/cdrecord/README.DVD.Debian

From ftp://ftp.berlios.de/pub/cdrecord/ProDVD/README

	This directory includes binary versions of cdrecord-ProDVD
			for various platforms


	NOTE: the DVD-recording drivers have been added to the OpenSource
	part on May 15th 2006 with cdrtools-2.01.01a09.

		See ftp://ftp.berlios.de/pub/cdrecord/alpha/

There is no longer a need for a key.

it looks like nowadays cdrecord allows writing dvd?