rgutter

I'm pretty sure you're right. On reflection, it was likely that the problem was triggered when I changed the SI driver to work around an unrelated issue my system starting exhibiting. I'll test this out later this week and report back - thanks for your input.

Thanks - I'm pretty sure it was installed as part of the Daemon Tools installation, so I had naively assumed DT would clean up after itself.

Ok, so my balloon is burst. But - wasn't the invalid handle message spurious anyways? As I said, when I ignored the couldn't lock message ImgBurn would always flawlessly burn the disc - obviously it had obtained a valid handle. Is your thought that at that point the device isn't really locked and that down the line some process may screw up the burn? (I'm not usually the pragmatic type, but having put a lot of hours into this I have to admit I'm tempted to either live with an undiagnosed base problem that has no operational effect, or to wait until an OS refresh to see if that has any effect.)

Since I had the latest version, I decided to uninstall Daemon, thinking that would also delete the SPTD driver. (It didn't, so the SPTD warning remains.) Rebooted and tried gain, without any luck. Since I had the Elaborate Bytes filter there too, I decided to take a "always suspect MS" approach and switched the I/O interface from SPTI to Elby CDIO. Success! Thanks for your help, and of course for the software. Richard

After years of flawless ImgBurning, I now encounter this problem on every burn on either of my drives. I've downloaded the latest version. I've checked for other processes holding the drive locked. I've removed suspect filters (and rebooted). I've cleared the Disable Media Change Notification flag. I've disabled AnyDVD. No go. Here's a recent log: I 17:29:17 ImgBurn Version 2.5.5.0 started! I 17:29:17 Microsoft Windows XP Professional (5.1, Build 2600 : Service Pack 3) I 17:29:17 Total Physical Memory: 2,096,356 KB - Available: 1,408,476 KB W 17:29:17 AnyDVD can interfere with ImgBurn's ability to verify accurately, please ensure it's disabled! W 17:29:17 Duplex Secure's SPTD driver can have a detrimental effect on drive performance. I 17:29:17 Initialising SPTI... I 17:29:17 Searching for SCSI / ATAPI devices... I 17:29:17 -> Drive 1 - Info: HL-DT-ST BD-RE BH10LS30 1.00 (E:) (ATA) I 17:29:17 -> Drive 2 - Info: HL-DT-ST DVD-RAM GSA-H55N 1.04 (D:) (ATA) I 17:29:17 -> Drive 3 - Info: SNW 2JSHYZ09Q 1.03 (I:) (SCSI) I 17:29:17 Found 1 DVD±RW/RAM, 1 BD-ROM/HD DVD-ROM and 1 BD-RE! I 17:31:44 Building Image Tree... I 17:31:44 Checking Directory Depth... I 17:31:44 Calculating Totals... I 17:31:44 Preparing Image... I 17:31:44 Checking Path Length... I 17:31:44 Contents: 11 Files, 2 Folders I 17:31:44 Content Type: DVD Video I 17:31:44 Data Type: MODE1/2048 I 17:31:44 File System(s): ISO9660, UDF (1.02) I 17:31:44 Volume Label: Test burn I 17:31:44 IFO/BUP 32K Padding: Enabled I 17:31:44 Region Code: 1, 2, 3, 4, 5, 6, 7, 8 I 17:31:44 TV System: PAL I 17:31:44 Size: 3,615,856,516 bytes I 17:31:44 Sectors: 1,765,556 I 17:31:44 Image Size: 3,616,473,088 bytes I 17:31:44 Image Sectors: 1,765,856 I 17:31:54 Operation Successfully Completed! - Duration: 00:00:10 I 17:31:54 Operation Started! I 17:31:54 Source File: -==/\/[bUILD IMAGE]\/\==- I 17:31:54 Source File Sectors: 1,765,856 (MODE1/2048) I 17:31:54 Source File Size: 3,616,473,088 bytes I 17:31:54 Source File Volume Identifier: Test burn I 17:31:54 Source File Volume Set Identifier: 3E498BF6001AF1DD I 17:31:54 Source File Application Identifier: IMGBURN V2.5.5.0 - THE ULTIMATE IMAGE BURNER! I 17:31:54 Source File Implementation Identifier: ImgBurn I 17:31:54 Source File File System(s): ISO9660, UDF (1.02) I 17:31:54 Destination Device: [2:1:0] HL-DT-ST BD-RE BH10LS30 1.00 (E:) (ATA) I 17:31:54 Destination Media Type: DVD-R (Disc ID: TYG03) (Speeds: 8x, 12x, 16x) I 17:31:54 Destination Media Sectors: 2,298,496 I 17:31:54 Write Mode: DVD I 17:31:54 Write Type: DAO I 17:31:54 Write Speed: 16x I 17:31:54 Link Size: Auto I 17:31:54 Lock Volume: Yes I 17:31:54 Test Mode: No I 17:31:54 OPC: No I 17:31:54 BURN-Proof: Enabled W 17:32:06 DeviceIoControl(IOCTL_CDROM_EXCLUSIVE_ACCESS, Lock, 1) Failed! - Reason: The handle is invalid. I 17:32:06 Write Speed Successfully Set! - Effective: 22,160 KB/s (16x) I 17:32:07 Filling Buffer... (40 MB) I 17:32:08 Writing LeadIn... I 17:32:44 Writing Session 1 of 1... (1 Track, LBA: 0 - 1765855) I 17:32:44 Writing Track 1 of 1... (MODE1/2048, LBA: 0 - 1765855) I 17:36:58 Synchronising Cache... I 17:37:15 Exporting Graph Data... I 17:37:15 Graph Data File: C:\Documents and Settings\Richard\Application Data\ImgBurn\Graph Data Files\HL-DT-ST_BD-RE_BH10LS30_1.00_FEBRUARY-9-2011_5-31_PM_TYG03_16x.ibg I 17:37:15 Export Successfully Completed! I 17:37:15 Operation Successfully Completed! - Duration: 00:05:14 I 17:37:15 Average Write Rate: 13,904 KB/s (10.0x) - Maximum Write Rate: 20,243 KB/s (14.6x) Note that after the unable to lock warning, when I tell the program to continue anyways it burns without problem. Here's what's left in my stripped-down filter list. =============================================== Filter Driver Load Order - ImgBurn v2.5.5.0 =============================================== Upper Device Filter: redbook Upper Class Filter: SiRemFil Device: CD/DVD-ROM Device Lower Class Filter: AnyDVD Lower Class Filter: ElbyCDFL Lower Class Filter: PxHelp20 Lower Device Filter: imapi Filter Name: redbook File Name: C:\WINDOWS\System32\DRIVERS\redbook.sys File Version: 5.1.2600.5512 (xpsp.080413-2108) File Description: Redbook Audio Filter Driver Product Name: Microsoft® Windows® Operating System Product Version: 5.1.2600.5512 Company Name: Microsoft Corporation Copyright: © Microsoft Corporation. All rights reserved. Filter Name: SiRemFil File Name: C:\WINDOWS\system32\DRIVERS\SiRemFil.sys File Version: 1, 1, 4, 0 [1.1.4.0] File Description: Filter driver for Silicon Image SATALink controllers. Product Name: Product Version: 1, 0, 0, 0 [1.0.0.0] Company Name: Silicon Image, Inc. Copyright: Copyright © 2005-2006 Silicon Image, Inc. Filter Name: AnyDVD File Name: C:\WINDOWS\System32\Drivers\AnyDVD.sys File Version: 6.6.5.7 File Description: AnyDVD Filter Driver Product Name: AnyDVD Product Version: 6.6.5.7 Company Name: SlySoft, Inc. Copyright: Copyright 2002 - 2010 SlySoft, Inc. Filter Name: ElbyCDFL File Name: C:\WINDOWS\System32\Drivers\ElbyCDFL.sys File Version: 5, 2, 1, 3 [5.2.1.3] File Description: ElbyCDIO Filter Driver Product Name: CloneCD Product Version: 5, 2, 1, 3 [5.2.1.3] Company Name: SlySoft, Inc. Copyright: Copyright © 2003 - 2006 SlySoft, Inc. Filter Name: PxHelp20 File Name: C:\WINDOWS\System32\Drivers\PxHelp20.sys File Version: 3.00.93.0 [3.0.93.0] File Description: Px Engine Device Driver for Windows 2000/XP Product Name: PxHelp20 Product Version: [2.0.0.0] Company Name: Sonic Solutions Copyright: Copyright © Sonic Solutions Filter Name: imapi File Name: C:\WINDOWS\System32\DRIVERS\imapi.sys File Version: 5.1.2600.5512 (xpsp.080413-2108) File Description: IMAPI Kernel Driver Product Name: Microsoft® Windows® Operating System Product Version: 5.1.2600.5512 Company Name: Microsoft Corporation Copyright: © Microsoft Corporation. All rights reserved. Is it worthwhile deleting more entries? Any other suggestions? Thanks. Richard