Here is the log from one that failed:
I 12:11:15 ImgBurn Version 2.5.7.0 started!
I 12:11:15 Microsoft Windows 7 Ultimate x64 Edition (6.1, Build 7601 : Service Pack 1)
I 12:11:15 Total Physical Memory: 16,775,352 KB - Available: 14,565,008 KB
I 12:11:15 Initialising SPTI...
I 12:11:15 Searching for SCSI / ATAPI devices...
I 12:11:15 -> Drive 1 - Info: Optiarc DVD RW AD-7261S 1.03 (E:) (ATA)
I 12:11:15 Found 1 DVD±RW/RAM!
I 12:11:28 Operation Started!
I 12:11:28 Building Image Tree...
I 12:11:30 Checking Directory Depth...
I 12:11:30 Calculating Totals...
I 12:11:30 Preparing Image...
I 12:11:30 Checking Path Length...
I 12:11:30 Contents: 17 Files, 0 Folders
I 12:11:30 Content Type: Data
I 12:11:30 Data Type: MODE1/2048
I 12:11:30 File System(s): ISO9660, UDF (1.02)
I 12:11:30 Volume Label: Recovery
I 12:11:30 Size: 816,947,368 bytes
I 12:11:30 Sectors: 398,907
I 12:11:30 Image Size: 817,561,600 bytes
I 12:11:30 Image Sectors: 399,200
E 12:11:42 Operation Aborted! - Duration: 00:00:14
I 12:11:47 Operation Started!
I 12:11:47 Building Image Tree...
I 12:11:48 Checking Directory Depth...
I 12:11:48 Calculating Totals...
I 12:11:48 Preparing Image...
I 12:11:48 Checking Path Length...
I 12:11:49 Contents: 15 Files, 0 Folders
I 12:11:49 Content Type: Data
I 12:11:49 Data Type: MODE1/2048
I 12:11:49 File System(s): ISO9660, UDF (1.02)
I 12:11:49 Volume Label: Recovery
I 12:11:49 Size: 728,580,288 bytes
I 12:11:49 Sectors: 355,758
I 12:11:49 Image Size: 729,186,304 bytes
I 12:11:49 Image Sectors: 356,048
E 12:11:50 Operation Aborted! - Duration: 00:00:02
I 12:11:54 Operation Started!
I 12:11:54 Building Image Tree...
I 12:11:55 Checking Directory Depth...
I 12:11:55 Calculating Totals...
I 12:11:55 Preparing Image...
I 12:11:55 Checking Path Length...
I 12:11:55 Contents: 14 Files, 0 Folders
I 12:11:55 Content Type: Data
I 12:11:55 Data Type: MODE1/2048
I 12:11:55 File System(s): ISO9660, UDF (1.02)
I 12:11:55 Volume Label: Recovery
I 12:11:55 Size: 682,048,864 bytes
I 12:11:55 Sectors: 333,037
I 12:11:55 Image Size: 682,655,744 bytes
I 12:11:55 Image Sectors: 333,328
I 12:11:58 Operation Successfully Completed! - Duration: 00:00:04
I 12:11:58 Operation Started!
I 12:11:58 Source File: -==/\/[bUILD IMAGE]\/\==-
I 12:11:58 Source File Sectors: 333,328 (MODE1/2048)
I 12:11:58 Source File Size: 682,655,744 bytes
I 12:11:58 Source File Volume Identifier: Recovery
I 12:11:58 Source File Volume Set Identifier: 40EF617B00051603
I 12:11:58 Source File Application Identifier: IMGBURN V2.5.7.0 - THE ULTIMATE IMAGE BURNER!
I 12:11:58 Source File Implementation Identifier: ImgBurn
I 12:11:58 Source File File System(s): ISO9660, UDF (1.02)
I 12:11:58 Destination Device: [2:1:0] Optiarc DVD RW AD-7261S 1.03 (E:) (ATA)
I 12:11:58 Destination Media Type: CD-R (Disc ID: 97m17s06f, Moser Baer India)
I 12:11:58 Destination Media Supported Write Speeds: 8x, 16x, 24x, 32x, 40x, 48x
I 12:11:58 Destination Media Sectors: 359,847
I 12:11:58 Write Mode: CD
I 12:11:58 Write Type: SAO
I 12:11:58 Write Speed: 40x
I 12:11:58 Lock Volume: Yes
I 12:11:58 Test Mode: No
I 12:11:58 OPC: No
I 12:11:58 BURN-Proof: Enabled
I 12:11:58 Write Speed Successfully Set! - Effective: 7,056 KB/s (40x)
I 12:11:58 Filling Buffer... (80 MB)
I 12:12:00 Writing LeadIn...
I 12:12:14 Writing Session 1 of 1... (1 Track, LBA: 0 - 333327)
I 12:12:14 Writing Track 1 of 1... (MODE1/2048, LBA: 0 - 333327)
I 12:15:06 Synchronising Cache...
W 12:15:09 Potential 'WaitImmediateIO' Deferred Error - (99%, 0/3) - The device is not connected.
W 12:15:09 Synchronise Cache Failed! - Reason: The device is not connected.
W 12:15:09 Retrying (1 of 3)...
W 12:15:09 Retry Failed - Reason: The device is not connected.
W 12:15:09 Retrying (2 of 3)...
W 12:15:09 Retry Failed - Reason: The specified network resource or device is no longer available.
W 12:15:09 Retrying (3 of 3)...
W 12:15:09 Retry Failed - Reason: The specified network resource or device is no longer available.
W 12:15:09 Device Removal Detected!
W 12:15:09 The device list will be refreshed at the next available opportunity.
I 12:15:16 Exporting Graph Data...
I 12:15:16 Graph Data File: C:\Users\Apoc\AppData\Roaming\ImgBurn\Graph Data Files\Optiarc_DVD_RW_AD-7261S_1.03_SUNDAY-JULY-15-2012_12-11_PM_97m17s06f_40x.ibg
I 12:15:16 Export Successfully Completed!
I 12:15:16 Operation Successfully Completed! - Duration: 00:03:17
I 12:15:16 Average Write Rate: 3,898 KB/s (26.0x) - Maximum Write Rate: 6,036 KB/s (40.2x)
I 12:15:17 Searching for SCSI / ATAPI devices...
W 12:15:17 No devices detected!
I 12:15:18 Close Request Acknowledged
I 12:15:18 Closing Down...
I 12:15:18 Shutting down SPTI...
I 12:15:18 ImgBurn closed!