Thank you all for the answers.

Let's see:
The disc was finalized.
In the meantime I tested the DVD in different DVD and DVD-
RW drives and all of them saw the content of the DVD.
Only my NEC fails.
Here are different test result:

dmesg:
After inserting the disc into the drive dmesg reports:
cdrom: This disc doesn't have any tracks I recognize!

wodim:
> wodim -atip dev=/dev/hda
This is wodim, not cdrecord. Don't expect it to behave like 
cdrecord in any
way, don't refer to it as "cdrecord". Send problem reports to
[EMAIL PROTECTED], don't bother Joerg 
Schilling with any
problems caused by this application.
Copyright (C) 2006 cdrkit maintainers, (C) 1994-2006 Joerg 
Schilling

Using libscg version 'debburn project-0.8ubuntu1+debburn1'.
wodim: Warning: using inofficial version of libscg (debburn 
project-0.8ubuntu1+debburn1 '@(#)scsitransp.c 1.91 04/06/17 
Copyright 1988,1995,2000-2004 J. Schilling').
wodim: Warning: using inofficial libscg transport code version 
(cdrkit-team-scsi-linux-sg.c-1.86 '@(#)scsi-linux-sg.c     1.86 
05/11/22 Copyright 1997 J. Schilling').
Device type    : Removable CD-ROM
Version        : 0
Response Format: 2
Capabilities   :
Vendor_info    : '_NEC    '
Identifikation : 'DVD_RW ND-3540A '
Revision       : '1.01'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.
wodim: Found DVD media: using cdr_mdvd.
Using Session At Once (SAO) for DVD mode.
Using generic SCSI-3/mmc DVD-R(W) driver (mmc_mdvd).
Driver flags   : SWABAUDIO BURNFREE
Supported modes: PACKET SAO
  ATIP start of lead in:  -150 (00:00/00)
Disk type:    unknown dye (reserved id code)
Manuf. index: -1
Manufacturer: unknown (not in table)


mounting:
# mount /dev/hda /mnt -t iso9660
mount: block device /dev/hda is write-protected, mounting 
read-only
mount: wrong fs type, bad option, bad superblock on /dev/hda,
       missing codepage or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so


wodim again:
wodim -prcap dev=/dev/hda
Device type    : Removable CD-ROM
Version        : 0
Response Format: 2
Capabilities   :
Vendor_info    : '_NEC    '
Identifikation : 'DVD_RW ND-3540A '
Revision       : '1.01'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.

Drive capabilities, per MMC-3 page 2A:

  Does read CD-R media
  Does write CD-R media
  Does read CD-RW media
  Does write CD-RW media
  Does read DVD-ROM media
  Does read DVD-R media
  Does write DVD-R media
  Does not read DVD-RAM media
  Does not write DVD-RAM media
  Does support test writing

  Does read Mode 2 Form 1 blocks
  Does read Mode 2 Form 2 blocks
  Does read digital audio blocks
  Does restart non-streamed digital audio reads accurately
  Does support Buffer-Underrun-Free recording
  Does read multi-session CDs
  Does read fixed-packet CD media using Method 2
  Does not read CD bar code
  Does read R-W subcode information
  Does not return R-W subcode de-interleaved and error-
corrected
  Does read raw P-W subcode data from lead in
  Does return CD media catalog number
  Does return CD ISRC information
  Does support C2 error pointers
  Does not deliver composite A/V data

  Does play audio CDs
  Number of volume control levels: 256
  Does support individual volume control setting for each 
channel
  Does support independent mute setting for each channel
  Does not support digital output on port 1
  Does not support digital output on port 2

  Loading mechanism type: tray
  Does support ejection of CD via START/STOP command
  Does not lock media on power up via prevent jumper
  Does allow media to be locked in the drive via PREVENT/
ALLOW command
  Is not currently in a media-locked state
  Does not support changing side of disk
  Does not have load-empty-slot-in-changer feature
  Does not support Individual Disk Present feature

  Maximum read  speed:  8467 kB/s (CD  48x, DVD  6x)
  Current read  speed:  8467 kB/s (CD  48x, DVD  6x)
  Maximum write speed:  8467 kB/s (CD  48x, DVD  6x)
  Current write speed:  8467 kB/s (CD  48x, DVD  6x)
  Rotational control selected: CLV/PCAV
  Buffer size in KB: 2048
  Copy management revision supported: 1
  Number of supported write speeds: 6
  Write speed # 0:  8467 kB/s CLV/PCAV (CD  48x, DVD  6x)
  Write speed # 1:  7056 kB/s CLV/PCAV (CD  40x, DVD  5x)
  Write speed # 2:  5645 kB/s CLV/PCAV (CD  32x, DVD  4x)
  Write speed # 3:  4234 kB/s CLV/PCAV (CD  24x, DVD  3x)
  Write speed # 4:  2822 kB/s CLV/PCAV (CD  16x, DVD  2x)
  Write speed # 5:  1411 kB/s CLV/PCAV (CD   8x, DVD  1x)

Supported CD-RW media types according to MMC-4 feature 
0x37:
  Does write multi speed       CD-RW media
  Does write high  speed       CD-RW media
  Does write ultra high speed  CD-RW media
  Does write ultra high speed+ CD-RW media


dmesg after failed mount command:
 attempt to access beyond end of device
hda: rw=0, want=68, limit=4
isofs_fill_super: bread failed, dev=hda, iso_blknum=16, 
block=16

IG





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