Nero Verification fails 95% of tries

I include a complete log from Nero 7

The write operation finish always with no warning but in verification, almost always (95%) there are files different from source.
DVDs are readable after burning but portions of files have different content from the source. (I check this with SFV)

Where is the problem? Maybe a defected device?

Regards
Paul Gessos

Chameleon

1C82-0000-19E5-MAAX-4002-0656-****

Windows XP 5.1
IA32
WinAspi: -
ahead WinASPI: File 'C:\Program Files\Nero\Nero Core\Wnaspi32.dll': Ver=2.0.1.74, size=164112 bytes, created 02 ═∩σ 2004 13:54:32 

NT-SPTI used
Nero Version: 7.5.7.0
Internal Version: 7, 5, 7, 0

Recorder:             <_NEC DVD_RW ND-3540A>    Version: 1.04 - HA 1 TA 0 - 7.5.7.0
 Adapter driver:      <IDE>                     HA 1
 Drive buffer  :      2048kB
 Bus Type      :      default (0) -> ATAPI, detected: ?
CD-ROM:               <HL-DT-ST DVD-ROM GDR8162B>Version: 0015 - HA 1 TA 1 - 7.5.7.0
 Adapter driver:      <IDE>                     HA 1

=== Scsi-Device-Map ===
DiskPeripheral       : WDC WD2500JB-00EVA0              atapi Port 0 ID 0  DMA: On 
DiskPeripheral       : WDC WD2500JB-00EVA0              atapi Port 0 ID 1  DMA: On 
CdRomPeripheral      : _NEC DVD_RW ND-3540A             atapi Port 1 ID 0  DMA: On 
CdRomPeripheral      : HL-DT-ST DVD-ROM GDR8162B        atapi Port 1 ID 1  DMA: On 

=== CDRom-Device-Map ===
HL-DT-ST DVD-ROM GDR8162B  E:   CDRom1
_NEC DVD_RW ND-3540A       F:   CDRom0
=======================

AutoRun : 1
Excluded drive IDs: 
WriteBufferSize: 74448896 (0) Byte
BUFE           : 0
Physical memory     : 511MB (523744kB)
Free physical memory: 86MB (88188kB)
Memory in use       : 83 %
Uncached PFiles: 0x0
Use Inquiry    : 1
Global Bus Type: default (0)
Check supported media : Disabled (0) 

6.12.2006
ISO compilation
18:43:54	#1 Text 0 File SCSIPassThrough.cpp, Line 583
	LockMCN - completed sucessfully for IOCTL_STORAGE_MCN_CONTROL
	
18:43:55	#2 Text 0 File Isodoc.cpp, Line 6508
	Iso document burn settings
	------------------------------------------
	Determine maximum speed : FALSE
	Simulate                : FALSE
	Write                   : TRUE
	Finalize CD             : TRUE
	Multisession            : FALSE
	Burning mode            : DAO
	Mode                    : 1
	ISO Level               : 1 (Max. of 11 = 8 + 3 char)
	Character set           : ISO 9660
	Joliet                  : TRUE
	Allow pathdepth more than 8 directories : FALSE
	Allow more than 255 characters in path  : FALSE
	Write ISO9660 ;1 file extensions        : TRUE
	
18:43:55	#3 ISO9660GEN -11 File Geniso.cpp, Line 3313
	First writeable address = 0 (0x00000000)
	
18:43:55	#4 Text 0 File Burncd.cpp, Line 3435
	Turn on Disc-At-Once, using DVD media
	
18:43:55	#5 Text 0 File DlgWaitCD.cpp, Line 301
	Last possible write address on media:  2298495 (510:46.45, 4489MB)
	Last address to be written:            2226559 (494:47.34, 4348MB)
	
18:43:55	#6 Text 0 File DlgWaitCD.cpp, Line 313
	Write in overburning mode: NO (enabled: CD)
	
18:43:55	#7 Text 0 File DlgWaitCD.cpp, Line 2863
	Recorder: _NEC DVD_RW ND-3540A, Media type: DVD-R
	 Disc Manufacturer: TYG02 - 
	 Disc Application Code: 64, Disc Physical Code: 193
	
18:43:55	#8 Text 0 File DlgWaitCD.cpp, Line 485
	>>> Protocol of DlgWaitCD activities: <<<
	=========================================
	
18:43:55	#9 Text 0 File ThreadedTransferInterface.cpp, Line 820
	Setup items (after recorder preparation)
	 0: TRM_DATA_MODE1 ()
	    2 indices, index0 (150) not provided
	    original disc pos #0 + 2226560 (2226560) = #2226560/494:47.35
	    relocatable, disc pos for caching/writing not required/ required, no patch infos
	    -> TRM_DATA_MODE1, 2048, config 0, wanted index0 0 blocks, length 2226560 blocks [Main]
	--------------------------------------------------------------
	
18:43:55	#10 Text 0 File ThreadedTransferInterface.cpp, Line 1033
	Prepare recorder [_NEC     DVD_RW ND-3540A] for write in CUE-sheet-DAO
	DAO infos:
	==========
	 MCN: ""
	 TOCType: 0x00; Session Closed, disc fixated
	 Tracks 1 to 1:                                  Idx 0         Idx 1      Next Trk
	   1: TRM_DATA_MODE1, 2048/0x00, FilePos             0             0    4559994880, ISRC ""
	DAO layout:
	===========
	 ___Start_|____Track_|_Idx_|_CtrlAdr_|_____Size_|______NWA_|_RecDep__________
	        0 |  lead-in |   0 |    0x41 |        0 |        0 | 0x00
	        0 |        1 |   0 |    0x41 |  2226560 |        0 | 0x00
	        0 |        1 |   1 |    0x41 |  2226560 |        0 | 0x00
	  2226560 | lead-out |   1 |    0x41 |        0 |        0 | 0x00
	
18:43:55	#11 Text 0 File SCSIPassThrough.cpp, Line 41
	SPTILockVolume - completed successfully for FCTL_LOCK_VOLUME
	
18:43:55	#12 Phase 36 File dlgbrnst.cpp, Line 1746
	Burn process started at 8x (11.080 KB/s)
	
18:43:55	#13 Text 0 File ThreadedTransferInterface.cpp, Line 2730
	Verifying disc position of item 0 (relocatable, disc pos, no patch infos, orig at #0): write at #0
	
18:43:55	#14 Text 0 File DVDR.cpp, Line 3026
	Recording mode: Sequential Recording Mode
	
18:43:55	#15 Text 0 File DVDR.cpp, Line 3182
	Start write address at LBA 0
	DVD high compatibility mode: Yes
	
18:43:55	#16 Text 0 File Cdrdrv.cpp, Line 9234
	---- DVD Structure: Physical Format Information (00h) ----
	Media Type: 0, Layer: 0, Address: 0 (0 h), AGID: 0; Length: 2050
	 Book Type: DVD-R (2), Part Version: 2.0x (5), Extended Part Version: 0.0 (0)
	 Disc Size: 120 mm,      Maximum Rate: <not specified> (F h)
	 Number of Layers: 1,    Track Path: Parallel Track Path (PTP),  Layer Type: recordable
	 Linear Density:         0,267 um/bit,  Track Density:  0,74 um/track
	 Starting Physical Sector Number of Data Area: 30000 h (DVD-ROM, DVD-R/-RW, DVD+R/+RW)
	 End Physical Sector Number of Data Area:      26127F h
	 End Sector Number in Layer 0:                 0 h (LBN: FFFD0000 h, 4193920 MB)
	 Data in Burst Cutting Area (BCA) does not exist
	  Start sector number of the current Border-Out: 2FE10 h
	  Start sector number of the next Border-In:     2FFA0 h
	 Media Specific [16..63]:
	    00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00    ................
	    00 02 FE 10 00 02 FF A0 - 00 00 00 00 00 00 00 00    ................
	    00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00    ................
	
18:44:20	#17 Text 0 File Cdrdrv.cpp, Line 1290
	18:44:20.828 - F: _NEC DVD_RW ND-3540A : Queue again later
	
18:53:48	#18 Text 0 File WriterStatus.cpp, Line 112
	<_NEC     DVD_RW ND-3540A > start writing Lead-Out at LBA 2226560 (21F980h), length 0 blocks
	
18:53:48	#19 Text 0 File DVDR.cpp, Line 3402
	EndDAO: Last written address was 2226559
	
18:54:07	#20 Phase 37 File dlgbrnst.cpp, Line 1746
	Burn process completed successfully at 8x (11.080 KB/s)
	
18:54:07	#21 Phase 78 File dlgbrnst.cpp, Line 1746
	Data verification started
	
18:59:13	#22 SectorVerify 11 File Cdrdrv.cpp, Line 10423
	Sector 1862895 on disc has different content to source
	
18:59:48	#23 SectorVerify 11 File Cdrdrv.cpp, Line 10423
	Sector 1928674 on disc has different content to source
	
18:59:48	#24 Phase 81 File dlgbrnst.cpp, Line 1746
	Data verification failed
	
18:59:48	#25 Text 0 File Cdrdrv.cpp, Line 10459
	DriveLocker: UnLockVolume completed
	
18:59:48	#26 Text 0 File SCSIPassThrough.cpp, Line 583
	UnLockMCN - completed sucessfully for IOCTL_STORAGE_MCN_CONTROL
	

Existing drivers:

Registry Keys:
HKLM\Software\Microsoft\Windows NT\CurrentVersion\WinLogon\AllocateCDROMs : 0 (Security Option) 

Verify with Nero cd dvd speed or imgburn.