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Unable to burn at 4x using cdrecord and dvd+rw-tools

I have a small problem with my dvd recorder. It's a NEC ND-1300A (dual
format). It writes DVD+/-R at 4x, DVD-RW at 2x and DVD+RW at 2.4x. 
cdrecord (either from cdrtools or ProDVD) reports that the drive can
write at most at 2x:

Cdrecord-ProDVD-Clone 2.01a26 (i686-pc-linux-gnu) Copyright (C) 1995-2004 Jörg Schilling
Unlocked features: ProDVD Clone 
Limited  features: 
This copy of cdrecord is licensed for: private/research/educational_non-commercial_use
TOC Type: 1 = CD-ROM
Using libscg version 'schily-0.8'.
atapi: 1
Device type    : Removable CD-ROM
Version        : 0
Response Format: 2
Capabilities   : 
Vendor_info    : '_NEC    '
Identifikation : 'DVD_RW ND-1300A '
Revision       : '1.0A'
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:  7056 kB/s (CD  40x, DVD  5x)
  Current read  speed:  7056 kB/s (CD  40x, DVD  5x)
  Maximum write speed:  2822 kB/s (CD  16x, DVD  2x)
  Current write speed:  2822 kB/s (CD  16x, DVD  2x)
  Rotational control selected: CLV/PCAV
  Buffer size in KB: 2048
  Copy management revision supported: 1
  Number of supported write speeds: 3
  Write speed # 0:  2822 kB/s CLV/PCAV (CD  16x, DVD  2x)
  Write speed # 1:  1411 kB/s CLV/PCAV (CD   8x, DVD  1x)
  Write speed # 2:   706 kB/s CLV/PCAV (CD   4x, DVD  0x)

It refuse to work at 4x (with 4x media of course) even using -force.
dvd+rw-tools shows the same behaviour. I also tried cdrecord + Warly's
(warly@mandrakesoft.com) patch without success. dvd+rw-mediainfo says:

INQUIRY:                [_NEC    ][DVD_RW ND-1300A ][1.0A]
 Mounted Media:         1Bh, DVD+R
 Write Performance:     3.9x1385=5408KB/s@[0 -> 2295104]
 Speed Descriptor#0:    00/2295104 R@7.8x1385=10816KB/s W@3.9x1385=5408KB/s
 Speed Descriptor#1:    00/2295104 R@7.8x1385=10816KB/s W@2.3x1385=3245KB/s
:-[ READ DVD STRUCTURE#0 failed with SK=5h/ASC=24h/ACQ=00h]: Input/output error
 Disc status:           blank
 Number of Sessions:    1
 State of Last Session: empty
 Number of Tracks:      1
 Track State:           blank
 Track Start Address:   0*2KB
 Next Writable Address: 0*2KB
 Free Blocks:           2295104*2KB
 Track Size:            2295104*2KB

The media is indeed 4x capable and it seems that the drive knows this.

OS is linux 2.6.3, with glibc 2.3.2. I tried both dev=ATAPI:0,0,0 and
dev=/dev/hdc. Oh, the drive does work at 4x under Windows.

Any clue of what's going on?

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