Cannot start disc-at-once

nero 6 v. 6.6.0.18, nec nd-2510a. will burn single layer ok but will not burn dual layer. always says cannot start disc at once.winxp,1 gig ram Drive : _NEC DVD_RW ND-2510A
Type : DVD±R/RW DL Recorder
Firmware Version : 2.0T
Buffer Size : 2 MB
Date : ?
Serial Number : 46M1K74S111
Vendor Specific : 0408100T
Drive Letter : D:
Location : 0:0
Mechanism : Tray
Read Speed : 61 , 31 X
Write Speed : n/a

Read CD Text : Yes
Return C2 Pointers : Yes
Read CD-R : Yes
Read CD-RW : Yes
Read DVD-ROM : Yes
Read DVD-RAM : No
Read DVD-R : Yes
Read DVD-RW : Yes
Read DVD+R : Yes
Read DVD+RW : Yes
Read DVD+R DL : Yes
Read BD-ROM : No
Read BD-R : No
Read BD-RE : No
Read Digital Audio : Yes
Read CD+G : Yes
Read VideoCD : Yes

Write CD-R : Yes
Write CD-RW : Yes
Write DVD-R : Yes
Write DVD-RW : Yes
Write DVD-R DL : No
Write DVD+R : Yes
Write DVD+RW : Yes
Write DVD+R DL : Yes
Write DVD-RAM : No
Write BD-R : No
Write BD-RE : No
Buffer Underrun Protection : Yes
Mount Rainier : No
Modes : Packet, TAO, DAO, SAO, RAW SAO, RAW DAO, RAW SAO 16, RAW SAO 96, RAW DAO 16, RAW DAO 96

Region Protection Control : RPC II
Region : 1
Changes User : 4
Changes Vendor : 4

Disc Information (D:)

Type : Blank DVD+R DL

Drive Information

Drive : LITE-ON CD-ROM LTN-487T
Type : CD-ROM Drive
Firmware Version : 6TS2
Buffer Size : 128 KB
Date : ?
Serial Number
Vendor Specific : týç
Drive Letter : E:
Location : 0:1
Mechanism : Tray
Read Speed : 48 X
Write Speed : n/a

Read CD Text : Yes
Return C2 Pointers : Yes
Read CD-R : Yes
Read CD-RW : Yes
Read DVD-ROM : No
Read DVD-RAM : No
Read DVD-R : No
Read DVD-RW : No
Read DVD+R : No
Read DVD+RW : No
Read DVD+R DL : No
Read BD-ROM : No
Read BD-R : No
Read BD-RE : No
Read Digital Audio : Yes
Read CD+G : No
Read VideoCD : Yes

Write CD-R : No
Write CD-RW : No
Write DVD-R : No
Write DVD-RW : No
Write DVD-R DL : No
Write DVD+R : No
Write DVD+RW : No
Write DVD+R DL : No
Write DVD-RAM : No
Write BD-R : No
Write BD-RE : No
Buffer Underrun Protection : No
Mount Rainier : No
Modes : n/a

Disc Information (E:)

Type : - no disc inserted -

Interface Information

Adapter 1

Description : Primary IDE Channel

Driver
Description : System32\DRIVERS\atapi.sys
Company : Microsoft Corporation
Version : 5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)
Description : IDE/ATAPI Port Driver

Attached Devices
Description : Master: _NEC DVD_RW ND-2510A
Type : CD-Rom Drive
DMA : On
Autorun : On
Description : Slave: LITE-ON CD-ROM LTN-487T
Type : CD-Rom Drive
DMA : On
Autorun : On

Adapter 2

Description : Secondary IDE Channel

Driver
Description : System32\DRIVERS\atapi.sys
Company : Microsoft Corporation
Version : 5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)
Description : IDE/ATAPI Port Driver

Attached Devices
Description : Master: WDC WD2000JD-22HBB0
Type : Disk Drive
DMA : On

Adapter 3

Description : Primary IDE Channel

Driver
Description : System32\DRIVERS\atapi.sys
Company : Microsoft Corporation
Version : 5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)
Description : IDE/ATAPI Port Driver

Attached Devices

Adapter 4

Description : Secondary IDE Channel

Driver
Description : System32\DRIVERS\atapi.sys
Company : Microsoft Corporation
Version : 5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)
Description : IDE/ATAPI Port Driver

Attached Devices

Adapter 5

Description : Intel® 82801FB/FBM USB2 Enhanced Host Controller - 265C

Driver
Description : System32\DRIVERS\usbehci.sys
Company : Microsoft Corporation
Version : 5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)
Description : EHCI eUSB Miniport Driver

Attached Devices
Description : eM Bay Reader USB Device
Type : Disk Drive
Description : eM Bay Reader USB Device
Type : Disk Drive
Description : eM Bay Reader USB Device
Type : Disk Drive
Description : eM Bay Reader USB Device
Type : Disk Drive

Software Information

Operating System : Windows XP Home Edition (5.01.2600 Service Pack 2)
DirectX : DirectX 9.0c

Description : Nero Burning ROM
Version : 6, 6, 0, 16
Company : Ahead Software AG
Version Check : Ok

Description : Nero StartSmart
Version : 2, 0, 0, 26
Company : Ahead Software AG

Description : NeroVision
Version : 3,1,0,16
Company : Nero AG

Description : Nero ShowTime
Version : 2, 0, 0, 44
Company : Nero Software AG

Description : Nero Recode 2
Version : 2, 2, 6, 17
Company : Ahead Software AG

Description : Cover Designer
Version : 2, 3, 0, 47
Company : Nero AG

Description : Nero BackItUp Application
Version : 1, 2, 0, 54
Company : Ahead Software AG

Description : PowerDVD
Version : 5.00.1107
Company : CyberLink Corp.

Hardware Information

CPU : ?
Bus Speed : ?
Motherboard : ?
System : ?
BIOS : ?
Memory : 1014 MB
Sound : HD Audio rear output
Video : Intel® 82915G Express Chipset Family