Bonjour.
J'arrive bien à graver avec XFBURN et en ligne de commande avec growisofs mais pas avec K3B. Cela n'est pas trop contraignant mais il ne faut pas rester sur un échec. Un dvd dans le graveur se monte bien et je sais le lire dans Thunar.

--> K3B affiche le message suivant :
Devices
-----------------------
PLDS DVD+-RW DH-16AAS JD12 (/dev/cd0, 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 séquentiel, DVD-R double couche séquentiel, DVD-RAM, DVD-RW à ré-inscription limitée, DVD-RW séquentiel, DVD+RW, DVD+R, DVD+R double couche, CD-ROM, CD-R, CD-RW] [SAO, TAO, RAW, SAO/R96P, SAO/R96R, RAW/R16, RAW/R96P, RAW/R96R, Ré-inscription restreinte] [%7]

System
-----------------------
K3b Version: 19.12.0
KDE Version: 5.65.0
Qt Version:  5.13.2
Kernel:      12.1-RELEASE-p2

Used versions
-----------------------
cdrecord: 3.1

cdrecord
-----------------------
scsidev: '/dev/cd0'
devname: '/dev/cd0'
scsibus: -2 target: -2 lun: -2
cdrecord: Invalid argument. Open by 'devname' not supported on this OS. Cannot open or use SCSI driver.
cdrecord: For possible targets try 'cdrecord -scanbus'.
cdrecord: For possible transport specifiers try 'cdrecord dev=help'.
Cdrecord-ProDVD-ProBD-Clone 3.01 (amd64-unknown-freebsd12.1) Copyright (C) 1995-2015 Joerg Schilling
TOC Type: 1 = CD-ROM

cdrecord command:
-----------------------
/usr/local/bin/cdrecord -v gracetime=2 dev=/dev/cd0 speed=4 -sao driveropts=burnfree -data -tsize=770560s -

--> et la commande cdrecord -scanbus affiche :
Cdrecord-ProDVD-ProBD-Clone 3.01 (amd64-unknown-freebsd12.1) Copyright (C) 1995-2015 Joerg Schilling
Using libscg version 'schily-0.9'.
scsibus0:
     0,0,0        0) '' '' '' NON CCS Disk
     0,1,0        1) *
     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) 'PLDS    ' 'DVD+-RW DH-16AAS' 'JD12' Removable CD-ROM
     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) *
scsibus2:
     2,0,0      200) '' '' '' NON CCS Disk
     2,1,0      201) *
     2,2,0      202) *
     2,3,0      203) *
     2,4,0      204) *
     2,5,0      205) *
     2,6,0      206) *
     2,7,0      207) *
scsibus3:
     3,0,0      300) '' '' '' NON CCS Disk
     3,1,0      301) *
     3,2,0      302) *
     3,3,0      303) *
     3,4,0      304) *
     3,5,0      305) *
     3,6,0      306)

--> Le contenu du fichier /usr/local/etc/cdrecord est :
#ident @(#)cdrecord.dfl      1.8 14/01/03 Copyr 1998-2014 J. Schilling
#
# This file is /usr/local/etc/cdrecord
# It contains defaults that are used if no command line option
# or environment is present.
#
# The default device, if not specified elswhere
# Note that since Sommer 2006, cdrecord by default searches for a
# single CD-ROM device. You should set CDR_DEVICE= together with
# an entry in the device table below only if you have more than
# one CR-ROM drive in your system.
#
#CDR_DEVICE=yamaha

#
# The default speed (speed=), if not specified elswhere
#
# Note that newer cdrecord versions do not default
# to speed=1. For MMC compliant drives, the default
# is to write at maximum speed, so it in general does
# not make sense to set up a default speed in /usr/local/etc/cdrecord
#
#CDR_SPEED=40

#
# The default FIFO size (fs=), if not specified elswhere
#
#CDR_FIFOSIZE=16m

#
# The default transfer size (ts=), if not specified elswhere
# The cdrecord default transfer size (currently) is 63k because
# Linux and Solaris have problems with bigger transfer sizes.
# If you are on FreeBSD, it is recommened to set CDR_TRANSFERSIZE=126k
#
CDR_TRANSFERSIZE=126k

#
# The following definitions allow abstract device names.
# They are used if the device name does not contain the
# the characters ',', ':', '/' and '@'
#
# Unless you have a good reason, use speed == -1 and let
# cdrecord use it's intercal drive specific defaults.
#
# Call cdrecord -scanbus to find the right "device name" for your
# drive. Then set up a list entry with an arbitraty logical name,
# followed by the SCSI device name of the drive. If speed or fifosize
# should stay with the defaults, insert a -1. If you do not need to
# set driveropts, use an empty string. The transfer size entry may be omitted.
# It is recommended to set "burnfree".
#
# The logical device name must be followed by an equal sign, the fields may
# be separated by one or more tab or space.
#
# drive name      device            speed      fifosize driveropts      transfersize
#
#my-default=      1,0,0            -1      -1      burnfree      63k
#sol-default=      USCSI:1,0,0      -1      -1      burnfree
#ricoh-u=      USCSI:0,2,0      -1      -1      burnfree
#teac=            1,3,0            -1      -1      ""
#teac-max-ts=      1,3,0            -1      -1      ""            32k
#panasonic=      1,4,0            -1      -1      ""
#plextor=      1,4,0            -1      -1      ""
#sanyo=            1,4,0            -1      -1      burnfree
#yamaha=            1,5,0            -1      -1      ""
#cdrom=            0,6,0            2      1m      ""
#remote=      REMOTE:rscsi@somehost:1,0,0 16      16m      burnfree
remote=      REMOTE:rscsi@host:1,2,0 16      16m      burnfree

Mais je ne sais pas quoi faire de tout cela.