Have to confess at being a novice as far as the technical side goes so maybe the Book Type comment does not highlight the problem I had not altered the settings of Nero until after the problem occurred on both DVD-R and DVD RW.
The log shows the following:
22:36:49 #22 Text 0 File DVDR.cpp, Line 4674
Drive: HL-DT-ST DVDRAM GSA-4163B
Book Type request: Physical disc type
Book Type setting not supported for the loaded disc type
22:36:49 #23 Text 0 File dlgbrnst.cpp, Line 1711
Set remaining time: 12:46,754 (766754ms) -> OK
22:36:49 #24 Text 0 File DVDPlusRW.cpp, Line 632
Start write address at LBA 0
DVD high compatibility mode: Yes
22:37:00 #25 SCSI -500 File Cdrdrv.cpp, Line 1432
SCSI Exec, HA 2, TA 1, LUN 0, buffer 0x0A800000
Status: 0x02 (0x03, SCSI_ABORTED)
HA-Status 0x10 (0x0A, SCSI_HASTAT_REQUEST_SENSE_FAILED)
TA-Status 0x00 (0x00, OK)
Sense Key: 0x05 (KEY_ILLEGAL_REQUEST)
Sense Code: 0x26
Sense Qual: 0x02
CDB Data: 0x2A 0x00 0x00 0x00 0x01 0xA0 0x00 0x00 0x20 0x00 0x00 0x00
Sense Data: 0xF0 0x00 0x05 0x00 0x00 0x00 0x00 0x00
0x00 0x00 0x00 0x00 0x26 0x02
22:37:00 #26 CDR -500 File Writer.cpp, Line 311
SCSI command aborted
HL-DT-ST DVDRAM GSA-4163B\H2 T1
22:37:00 #27 Text 0 File ThreadedTransfer.cpp, Line 229
all writers idle, stopping conversion
22:37:04 #28 Text 0 File ThreadedTransfer.cpp, Line 223
conversion idle, stopping reader
22:37:05 #29 Text 0 File dlgbrnst.cpp, Line 1711
Set remaining time: 0:00,000 (0ms) -> OK
22:37:05 #30 Text 0 File dlgbrnst.cpp, Line 1711
Set remaining time: 0:00,000 (0ms) -> OK
22:37:05 #31 Phase 38 File dlgbrnst.cpp, Line 1853
Burn process failed at 4x (5,540 KB/s)
Existing drivers:
File ‘Drivers\ASPI32.SYS’: Ver=4.71 (0001), size=17005 bytes, created 14/08/2002 16:03:36
File ‘Drivers\InCDfs.SYS’: Ver=4, 3, 0, 5, size=93440 bytes, created 13/09/2004 12:54:06 (InCD4 driver for win NT/2K/XP)
File ‘Drivers\InCDpass.SYS’: Ver=4, 3, 0, 5, size=28672 bytes, created 13/09/2004 12:54:46 (InCD4 driver for win NT/2K/XP)
File ‘Drivers\InCDrec.SYS’: Ver=4, 3, 0, 5, size=7680 bytes, created 13/09/2004 12:58:10 (InCD4 driver for win NT/2K/XP)
Registry Keys:
HKLM\Software\Microsoft\Windows NT\CurrentVersion\WinLogon\AllocateCDROMs : 0 (Security Option)