Having errors when burning DVD+R DL

Hi, a little bit more than a year ago I bought a Plextor 760A burner, which burns all kind of DVD (except DVD-RAM). It has been under heavy use all year long and has not given me a failed burn under optimal conditions (using the best quality DVD'S taiyo yudens and verbatims). But a little ago I went to burn DVD+R DL and I started having problems, or i might get a burn error in the middle of the burn, or it will burn perfectly but when I scanned for PI/PO errors those numbers would be on the sky (and even some PO failures), so Im wondering what I may it be.

Dont think I already googled the problem but I dont find any specific information, and Im really worried because I have like 5 Dual layer Dvd's waiting to be burned but until I solve this problem I cant burn them.

I have burned aproximately 7 dual layers when this problem started, When I used Verbatim (MKM), I burned 6 of them, 2 of them failed completely in the middle of the burn, the others had PI/PO numbers really high.
I used Ritek Dual layer, It burned perfectly but PI/PO numbers were really high again.
Today I tried used RICOHJPN media, and it did not even start the burn.
Just to clarify I used the MKM on a friends burner and it burned perfectly with almost a perfect PI/PO scan when I did it on my burner.

I usually burn with NERO 7.5, but I also tried using DVD decrypter in one case and got the same problem, and just to clarify Im still being able to flawlessly burn single layer DVDS (which give me almost perfect PI/PO scans) and Rewritable DVDS without a single problem.

I dont know if it might help, but this is the Nero log for the failed RICOHJPN burn that I tried today (it did not even start):

Windows XP 5.1
IA32
WinAspi: -
ahead WinASPI: File 'C:\Archivos de programa\Nero\Nero 7\Core\Wnaspi32.dll': Ver=2.0.1.74, size=164112 bytes, created 02/11/2004 13:54:32

NT-SPTI used
Nero Version: 7.5.7.0
Internal Version: 7, 5, 7, 0
(Nero Express)
Recorder: <PLEXTOR DVDR PX-760A> Version: 1.07 - HA 1 TA 0 - 7.5.7.0
Adapter driver: <IDE> HA 1
Drive buffer : 2048kB
Bus Type : default (0) -> ATAPI, detected: ?
CD-ROM: <PLEXTOR DVDR PX-760A >Version: 1.07 - HA 1 TA 0 - 7.5.7.0
Adapter driver: <IDE> HA 1

=== Scsi-Device-Map ===
CdRomPeripheral : PLEXTOR DVDR PX-760A atapi Port 0 ID 0 DMA: On
CdRomPeripheral : SONY DVD-ROM DDU1615 atapi Port 0 ID 1 DMA: On
DiskPeripheral : WDC WD740GD-00FLC0 atapi Port 1 ID 1 DMA: On
DiskPeripheral : External Disk 0 atapi Port 2 ID 0 DMA: On
DiskPeripheral : ST3400833NS atapi Port 2 ID 1 DMA: On

=== CDRom-Device-Map ===
PLEXTOR DVDR PX-760A D: CDRom0
SONY DVD-ROM DDU1615 F: CDRom1
=======================

AutoRun : 1
Excluded drive IDs:
WriteBufferSize: 83886080 (0) Byte
BUFE : 0
Physical memory : 2047MB (2096172kB)
Free physical memory: 873MB (894464kB)
Memory in use : 57 %
Uncached PFiles: 0x0
Use Inquiry : 1
Global Bus Type: default (0)
Check supported media : Disabled (0)

10.12.2007
Compilación UDF/ISO
6:39:12 #1 Text 0 File SCSIPassThrough.cpp, Line 583
LockMCN - completed sucessfully for IOCTL_STORAGE_MCN_CONTROL

6:39:13 #2 Phase 112 File dlgbrnst.cpp, Line 1746
DVD-Video files reallocation started

6:39:13 #3 Phase 114 File dlgbrnst.cpp, Line 1746
DVD-Video files reallocation completed (no file modified)

6:39:13 #4 Text 0 File Isodoc.cpp, Line 6508
UDF document burn settings
------------------------------------------
Determine maximum speed : FALSE
Simulate : FALSE
Write : TRUE
Finalize CD : TRUE
Multisession : FALSE
Burning mode : DAO
Mode : 1
UDF Mode : UDF/ISO bridge
UDF Options : automatic
UDF Revision : 1.02
UDF Partition Type : physical
ISO Level : 1 (Max. of 11 = 8 + 3 char)
Character set : ISO 9660
Joliet : FALSE
Allow pathdepth more than 8 directories : FALSE
Allow more than 255 characters in path : FALSE
Write ISO9660 ;1 file extensions : TRUE

6:39:13 #5 Phase 111 File dlgbrnst.cpp, Line 1746
DVD-Video files sorted

6:39:13 #6 ISO9660GEN -11 File Geniso.cpp, Line 3313
First writeable address = 0 (0x00000000)

6:39:13 #7 ISO9660GEN -11 File Geniso.cpp, Line 3313
First writeable address = 0 (0x00000000)

6:39:13 #8 Text 0 File Burncd.cpp, Line 3435
Turn on Disc-At-Once, using DVD media

6:39:14 #9 Text 0 File DlgWaitCD.cpp, Line 301
Last possible write address on media: 4173823 (927:30.73, 8151MB)
Last address to be written: 1856751 (412:36.51, 3626MB)

6:39:14 #10 Text 0 File DlgWaitCD.cpp, Line 313
Write in overburning mode: NO (enabled: CD)

6:39:14 #11 Text 0 File DlgWaitCD.cpp, Line 2863
Recorder: PLEXTOR DVDR PX-760A, Media type: DVD+R9 Double Layer
Disc Manufacturer ID: RICOHJPN, Media Type ID: D01, Product revision number: 67
Disc Application Code: 0, Extended Information Indicators: 3

6:39:14 #12 Text 0 File DlgWaitCD.cpp, Line 485
>>> Protocol of DlgWaitCD activities: <<<
=========================================

6:39:14 #13 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 + 1856752 (1856752) = #1856752/412:36.52
relocatable, disc pos for caching/writing not required/ required, no patch infos
-> TRM_DATA_MODE1, 2048, config 0, wanted index0 0 blocks, length 1856752 blocks [Main]
--------------------------------------------------------------

6:39:14 #14 Text 0 File ThreadedTransferInterface.cpp, Line 1033
Prepare recorder [PLEXTOR DVDR PX-760A] 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 3802628096, ISRC ""
DAO layout:
===========
___Start_|____Track_|_Idx_|_CtrlAdr_|_____Size_|______NWA_|_RecDep__________
0 | lead-in | 0 | 0x41 | 0 | 0 | 0x00
0 | 1 | 0 | 0x41 | 1856752 | 0 | 0x00
0 | 1 | 1 | 0x41 | 1856752 | 0 | 0x00
1856752 | lead-out | 1 | 0x41 | 0 | 0 | 0x00

6:39:14 #15 Text 0 File SCSIPassThrough.cpp, Line 41
SPTILockVolume - completed successfully for FCTL_LOCK_VOLUME

6:39:14 #16 Phase 24 File dlgbrnst.cpp, Line 1746
Caching of files started

6:39:14 #17 Text 0 File Burncd.cpp, Line 4262
Cache writing successful.

6:39:14 #18 Phase 25 File dlgbrnst.cpp, Line 1746
Caching of files completed

6:39:14 #19 Phase 36 File dlgbrnst.cpp, Line 1746
Burn process started at 4x (5.540 KB/s)

6:39:14 #20 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

6:39:14 #21 SPTI -1066 File SCSIPassThrough.cpp, Line 293
D: CdRom0: SCSIStatus(x02) WinError(0) NeroError(-1066)
Sense Key: 0x05 (KEY_ILLEGAL_REQUEST)
Sense Code: 0x24
Sense Qual: 0x00
CDB Data: 0xAD 00 00 00 00 00 00 21 08 04 00 00
Sense Area: 0x70 00 05 00 00 00 00 0A 00 00 00 00 24
Buffer x068d7000: Len x804

6:39:14 #22 Text 0 File DVDPlusDualLayer.cpp, Line 635
L0 Data Zone Capacity set to 928480 (E2AE0h, 1813MB) -> OK, confirmed setting

6:39:14 #23 CDR -1205 File DVDPlusDualLayer.cpp, Line 662
Burning Layer 1

6:39:14 #24 Text 0 File DVDPlusDualLayer.cpp, Line 672
Start writing layer 1 at address 0 (0h)
Recording mode: unknown Recording Mode

6:39:14 #25 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: 258
Book Type: DVD+R DL (14), Part Version: 1.0x (1)
Disc Size: 120 mm, Maximum Rate: <not specified> (F h)
Number of Layers: 2, Track Path: Opposite Track Path (OTP), Layer Type: recordable
Linear Density: 0,293 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: FCFFFF h
End Sector Number in Layer 0: 112ADF h (LBN: E2ADF h, 1813 MB)
Data in Burst Cutting Area (BCA) does not exist
Disc Application Code: 0 / 0 h
Extended Information indicators: 3 h
Disc Manufacturer ID: RICOHJPN
Media type ID: D01
Product revision number: 67
Number of Physical format information bytes in use in ADIP up to byte 63: 64
Media Specific [16..63]:
00 00 03 52 49 43 4F 48 - 4A 50 4E 44 30 31 43 40 ...RICOHJPND01C@
25 25 37 10 00 2C 6C 00 - 2C 6C 20 1F 0C 0C 14 14 %%7..,l.,l......
02 01 01 20 00 20 1F 0C - 0C 14 14 02 01 01 20 00 ................

6:39:14 #26 Text 0 File DVDR.cpp, Line 6515
Drive: PLEXTOR DVDR PX-760A
Book Type request [PX]: DVD-ROM
Changing the Book Type was finished successfully, return code 0

6:39:14 #27 CDR -1207 File DVDR.cpp, Line 6143
Book Type automatically set to: DVD-ROM

6:39:14 #28 Text 0 File DVDPlusRW.cpp, Line 662
Start write address at LBA 0
DVD high compatibility mode: Yes

6:39:15 #29 Text 0 File Cdrdrv.cpp, Line 1290
06:39:15.562 - D: PLEXTOR DVDR PX-760A : Queue again later

6:39:38 #30 SPTI -1015 File SCSIPassThrough.cpp, Line 293
D: CdRom0: SCSIStatus(x02) WinError(0) NeroError(-1015)
Sense Key: 0x03 (KEY_MEDIUM_ERROR)
Sense Code: 0x73
Sense Qual: 0x02
CDB Data: 0x2A 00 00 00 00 20 00 00 20 00 00 00
Sense Area: 0x70 00 03 00 00 00 00 0A 00 00 00 00 73 02
Buffer x06773800: Len x10000
0x01 00 02 00 60 00 00 00 A6 A6 F0 01 20 00 00 00
0x00 00 00 00 00 00 00 00 08 54 48 45 5F 53 45 43
0x52 45 54 00 00 00 00 00 00 00 00 00 00 00 00 00

6:39:38 #31 CDR -1015 File Writer.cpp, Line 278
Calibration area full
D: PLEXTOR DVDR PX-760A

6:39:38 #32 SPTI -1066 File SCSIPassThrough.cpp, Line 293
D: CdRom0: SCSIStatus(x02) WinError(0) NeroError(-1066)
Sense Key: 0x05 (KEY_ILLEGAL_REQUEST)
Sense Code: 0x24
Sense Qual: 0x00
CDB Data: 0x5B 01 01 00 00 01 00 00 00 00 00 00
Sense Area: 0x70 00 05 00 00 00 00 0A 00 00 00 00 24

6:39:38 #33 SPTI -1066 File SCSIPassThrough.cpp, Line 293
D: CdRom0: SCSIStatus(x02) WinError(0) NeroError(-1066)
Sense Key: 0x05 (KEY_ILLEGAL_REQUEST)
Sense Code: 0x24
Sense Qual: 0x00
CDB Data: 0x5B 01 05 00 00 00 00 00 00 00 00 00
Sense Area: 0x70 00 05 00 00 00 00 0A 00 00 00 00 24

6:39:38 #34 Phase 127 File dlgbrnst.cpp, Line 1746
Generating DVD high compatibility borders

6:39:38 #35 Text 0 File DVDR.cpp, Line 6515
Drive: PLEXTOR DVDR PX-760A
Book Type request [PX]: DVD-ROM
Changing the Book Type was finished successfully, return code 0

6:39:38 #36 CDR -1066 File WriterStatus.cpp, Line 161
Invalid field in command
D: PLEXTOR DVDR PX-760A

6:39:38 #37 TRANSFER -24 File WriterStatus.cpp, Line 161
Could not perform end of Disc-at-once

6:39:38 #38 Phase 38 File dlgbrnst.cpp, Line 1746
Burn process failed at 4x (5.540 KB/s)

6:39:38 #39 Text 0 File Cdrdrv.cpp, Line 10459
DriveLocker: UnLockVolume completed

6:39:38 #40 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)