Please insert a Double Layer DVD+-R

Hello
        
        I successfully burnt an iso image (4.3Go) on a DVD+RW with k3b
        and/or growisofs alone.
        
        When I tried to burn the same iso image on a DVD+R 
        I got the famous window :
        
        "DVD+R non finalisé 
        Veuillez insérer un Double layer DVD+-R dans le
        lecteur /dev/hdd"
        
        and in the log file :
        
        "KNotify dim fév 17 15:10:15 2008: Attente d'un média"
        
        
        A try with growisofs gives these message before stopping:
        
        ....
        :-? resuming track#1 from LBA#752
           3112960/4606885888 ( 0.1%) @0.0x, remaining 147:53 RBU 100.0%
        UBU   0.0%
           3112960/4606885888 ( 0.1%) @0.0x, remaining 221:50 RBU 100.0%
        UBU 100.0%
           3112960/4606885888 ( 0.1%) @0.0x, remaining 320:25 RBU 100.0%
        UBU 100.0%
           3112960/4606885888 ( 0.1%) @0.0x, remaining 394:22 RBU 100.0%
        UBU 100.0%
           3112960/4606885888 ( 0.1%) @0.0x, remaining 468:19 RBU 100.0%
        UBU 100.0%
           3112960/4606885888 ( 0.1%) @0.0x, remaining 566:54 RBU 100.0%
        UBU 100.0%
        :-[ WRITE@LBA=5f0h failed with SK=4h/ASC=03h/ACQ=00h]:
        Input/output error
        :-( write failed: Input/output error
        /dev/dvd: flushing cache
        /dev/dvd: closing track
        /dev/dvd: closing disc
        :-[ CLOSE DISC failed with SK=5h/ASC=30h/ACQ=05h]: Wrong medium
        type
        /dev/dvd: reloading tray
        
        
        Could you tell me what is the origin of the problem (I did not
        see any answer to this problem
        on the web.) and what can I do to fix it.
        
        Thanks
        Francois Colonna
        
        
        
        


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