Nero problem on burn

I am using Nero 6.3.15 and DVD burner Toshiba SD-6012. Everything was working fine but suddenly the DVD's I burn show error 'Function 5 Error' I can see all DVD's except what I burn in by Burner with Nero.
Please help

 

Hi guys here is the error Log from Nero ...can somebody help

Windows XP 5.1
IA32
WinAspi: File 'Wnaspi32.dll': Ver=4.60 (1021), size=45056 bytes, created 10/09/1999 12:06:00
ahead WinASPI: File 'C:\Program Files\Ahead\nero\Wnaspi32.dll': Ver=2.0.1.59, size=160016 bytes, created 16/12/2003 20:18:06
Nero version: 6.3.1.15
Recorder: <TOSHIBA DVD-ROM SD-R6012>Version: 1S34 - HA 1 TA 0 - 6.3.1.15
Adapter driver: <atapi> HA 1
Drive buffer : 2048kB
Bus Type : default (0) -> ATAPI, detected: ATAPI
CD-ROM: <TOSHIBA DVD-ROM SD-R6012>Version: 1S34 - HA 1 TA 0 - 6.3.1.15
Adapter driver: <atapi> HA 1

=== Scsi-Device-Map ===
DiskPeripheral : HITACHI_DK23EA-40 atapi Port 0 ID 0 DMA: On
CdRomPeripheral : TOSHIBA DVD-ROM SD-R6012 atapi Port 1 ID 0 DMA: On

=== CDRom-Device-Map ===
TOSHIBA DVD-ROM SD-R6012 F: CDRom0
=======================

AutoRun : 1
Excluded drive IDs:
WriteBufferSize: 57671680 (0) Byte
ShowDrvBufStat : 0
BUFE : 0
Physical memory : 382MB (392176kB)
Free physical memory: 140MB (143632kB)
Memory in use : 63 %
Uncached PFiles: 0x0
Use Static Write Speed Table: 0
Use Inquiry : 1
Global Bus Type: default (0)
Check supported media : Disabled (0)

6.6.2004
ISO compilation
22:35:05 #1 Text 0 File Isodoc.cpp, Line 6065
Iso document burn settings
------------------------------------------
Determine maximum speed : FALSE
Simulate : FALSE
Write : TRUE
Finalize CD : FALSE
Multisession : TRUE
Multisession type: : Start multisession
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 : TRUE
Allow more than 255 characters in path : TRUE
Write ISO9660 ;1 file extensions : TRUE

22:35:05 #2 Text 0 File Reader.cpp, Line 118
Reader running

22:35:05 #3 Text 0 File Writer.cpp, Line 124
Writer TOSHIBA DVD-ROM SD-R6012 running

22:35:05 #4 ISO9660GEN -11 File geniso.cpp, Line 3899
First writeable address = 0 (0x00000000)

22:35:05 #5 Text 0 File Burncd.cpp, Line 3167
Turn on Disc-at-once, using DVD media

22:35:06 #6 Text 0 File DlgWaitCD.cpp, Line 245
Last possible write address on media: 2298495 (510:46.45, 4489MB)
Last address to be written: 2075455 (461:12.55, 4053MB)

22:35:06 #7 Text 0 File DlgWaitCD.cpp, Line 257
Write in overburning mode: NO (enabled: CD)

22:35:06 #8 Text 0 File DlgWaitCD.cpp, Line 2137
Recorder: TOSHIBA DVD-ROM SD-R6012, Media type: DVD-R
Disc Manufacturer: OPTODI - SCR004
Disc Application Code: 64, Disc Physical Code: 193

22:35:06 #9 Text 0 File DlgWaitCD.cpp, Line 418
>>> Protocol of DlgWaitCD activities: <<<
=========================================

22:35:06 #10 Text 0 File ThreadedTransferInterface.cpp, Line 813
Setup items (after recorder preparation)
0: TRM_DATA_MODE1 (CTransferItem)
2 indices, index0 (150) not provided
original disc pos #0 + 2075456 (2075456) = #2075456/461:12.56
relocatable, disc pos for caching/writing not required/required, no patch infos
-> TRM_DATA_MODE1, 2048, config 0, wanted index0 0 blocks, length 2075456 blocks [TOSHIBA DVD-ROM SD-R6012]
--------------------------------------------------------------

22:35:20 #11 Text 0 File ThreadedTransferInterface.cpp, Line 983
Prepare recorder [TOSHIBA DVD-ROM SD-R6012] for write in CUE-sheet-DAO
DAO infos:
==========
MCN: ""
TOCType: 0x00; Session Closed, disc not fixated
Tracks 1 to 1:
1: TRM_DATA_MODE1, 2048/0x00, FilePos 0 0 4250533888, ISRC ""
DAO layout:
===========
__Start_|____Track_|_Idx_|_RecDep_|_CtrlAdr_
0 | lead-in | 0 | 0x00 | 0x41
0 | 1 | 0 | 0x00 | 0x41
0 | 1 | 1 | 0x00 | 0x41
2075456 | lead-out | 1 | 0x00 | 0x41

22:35:21 #12 Phase 24 File dlgbrnst.cpp, Line 1845
Caching of files started

22:35:21 #13 Text 0 File Burncd.cpp, Line 4177
Cache writing successful.

22:35:21 #14 Phase 25 File dlgbrnst.cpp, Line 1845
Caching of files completed

22:35:21 #15 Phase 36 File dlgbrnst.cpp, Line 1845
Burn process started at 1x (1,385 KB/s)

22:35:21 #16 Text 0 File ThreadedTransferInterface.cpp, Line 2343
Verifying disc position of item 0 (relocatable, disc pos, no patch infos, orig at #0): write at #0

22:35:21 #17 Text 0 File dlgbrnst.cpp, Line 1703
Set remaining time: 51:21,898 (3081898ms) -> OK

22:35:21 #18 Text 0 File DVDR.cpp, Line 1840
Recording mode: Sequential Recording Mode for Multisession

22:35:21 #19 Text 0 File Mmc.cpp, Line 20239
Set BUFE: supported -> ON

22:35:21 #20 Text 0 File DVDR.cpp, Line 1981
Start write address at LBA 0
DVD high compatibility mode: Yes

22:35:21 #21 Text 0 File Cdrdrv.cpp, Line 8120
---- DVD Structure: Physical Format Information (00h) ----
Layer: 0, Address: 0 (0 h), AGID: 0; Length: 2050
Book Type: DVD-R (2), Part Version: 5
Disc Size: 120 mm, Maximum Rate: 10.08 Mbps (2 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: 30000 h
End Sector Number in Layer 0: 0 h
Data in Burst Cutting Area (BCA) does not exist
Start sector number of the current Border-Out: 0 h
Start sector number of the next Border-In: 0 h
Media Specific [16..63]:
00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ................

23:26:32 #22 Text 0 File WriterStatus.cpp, Line 115
<TOSHIBA DVD-ROM SD-R6012> start writing Lead-Out at LBA 2075456 (1FAB40h), lenght 0 blocks

23:26:32 #23 Text 0 File ThreadedTransfer.cpp, Line 229
all writers idle, stopping conversion

23:26:32 #24 Text 0 File DVDR.cpp, Line 2215
EndDAO: Last written address was 2075455

23:26:35 #25 Phase 133 File dlgbrnst.cpp, Line 1845
Writing short lead-out

23:29:04 #26 Text 0 File dlgbrnst.cpp, Line 1703
Set remaining time: 0:00,000 (0ms) -> OK

23:29:04 #27 Text 0 File dlgbrnst.cpp, Line 1703
Set remaining time: 0:00,000 (0ms) -> OK

23:29:04 #28 Phase 37 File dlgbrnst.cpp, Line 1845
Burn process completed successfully at 1x (1,385 KB/s)

23:29:05 #29 Phase 78 File dlgbrnst.cpp, Line 1845
Data verification started

23:30:36 #30 VERIFYERR 10 File UDFCompilationImpl.cpp, Line 1282
Cannot mount the written CD
"TOSHIBA DVD-ROM SD-R6012" (H:1, T:0)

23:30:36 #31 VERIFYERR 13 File UDFCompilationImpl.cpp, Line 1380
Status summary
Total files=0, identical=0, different=0, inaccessible=0, skipped=0.

23:30:36 #32 Phase 81 File dlgbrnst.cpp, Line 1845
Data verification failed


Existing drivers:
File 'Drivers\ASPI32.SYS': Ver=4.60 (1021), size=25244 bytes, created 10/09/1999 12:06:00
File 'Drivers\PXHELP20.SYS': Ver=2.02.50a, size=17136 bytes, created 16/01/2003 11:02:00 (Prassi/Veritas driver for win 2K)
File 'Drivers\atapi.sys': Ver=5.1.2600.1106 (xpsp1.020828-1920), size=86912 bytes, created 29/08/2002 13:00:00 (Adapter driver for rec)

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