I've tried several of these- after a couple of burns with successful verification, I stopped verifying after the burn, because I didn't feel that this was an area of concern. Here is the log from one of the early ones that I did verify:
I 13:18:22 Operation Started!
I 13:18:22 Source File: E:\VidFiles\LIB\dvd9\LIB.iso
I 13:18:22 Source File Sectors: 3,176,448 (MODE1/2048)
I 13:18:22 Source File Size: 6,505,365,504 bytes
I 13:18:22 Source File Volume Identifier: LIB
I 13:18:22 Source File Implementation Identifier: Ulead Systems USA Inc.
I 13:18:22 Source File File System(s): ISO9660, Joliet, UDF (1.02)
I 13:18:22 Destination Device: [1:0:0] Optiarc DVD RW AD-7170A 1.03 (G:) (ATA)
I 13:18:22 Destination Media Type: DVD+R DL (Disc ID: RICOHJPN-D00-01) (Speeds: 2.4x)
I 13:18:22 Destination Media Sectors: 4,173,824
I 13:18:22 Write Mode: DVD
I 13:18:22 Write Type: DAO
I 13:18:22 Write Speed: MAX
I 13:18:22 Link Size: Auto
I 13:18:22 Test Mode: No
I 13:18:22 BURN-Proof: Enabled
I 13:19:17 Optimal L1 Data Zone Start LBA: 1853280 (VTS_01, PGC: 2, Cell: 1, Vob/Cell ID: 2/1, Time: 00:00:00, SPLIP: No)
I 13:19:17 Optimal L0 Data Zone Capacity: 1,853,280
I 13:19:17 Optimal L0 Data Zone Method: IFO Cell Boundary, 'SPLIP' Flag Not Set
I 13:19:45 Filling Buffer... (40 MB)
I 13:19:45 Writing LeadIn...
I 13:19:47 Writing Image... (LBA: 0 - 3176447)
I 13:19:47 Writing Layer 0... (LBA: 0 - 1853279)
I 13:38:21 Writing Layer 1... (LBA: 1853280 - 3176447)
I 13:52:13 Synchronising Cache...
I 13:52:14 Closing Track...
I 13:52:36 Finalising Disc...
I 13:59:03 Image MD5: 32ac42c50fab0609aeddbab041a1d4c6
I 13:59:03 Operation Successfully Completed! - Duration: 00:40:40
I 13:59:03 Average Write Rate: 3,266 KB/s (2.4x) - Maximum Write Rate: 3,465 KB/s (2.5x)
I 13:59:03 Cycling Tray before Verify...
I 13:59:29 Device Ready!
I 13:59:30 Operation Started!
I 13:59:30 Source Device: [1:0:0] Optiarc DVD RW AD-7170A 1.03 (G:) (ATA)
I 13:59:30 Source Media Type: DVD+R DL (Book Type: DVD-ROM) (Disc ID: RICOHJPN-D00-01) (Speeds: 2.4x)
I 13:59:30 Image File: E:\VidFiles\LIB\dvd9\LIB.iso
I 13:59:30 Image File Sectors: 3,176,448 (MODE1/2048)
I 13:59:30 Image File Size: 6,505,365,504 bytes
I 13:59:30 Image File Volume Identifier: LIB
I 13:59:30 Image File Implementation Identifier: Ulead Systems USA Inc.
I 13:59:30 Image File File System(s): ISO9660, Joliet, UDF (1.02)
I 13:59:30 Verifying Sectors... (LBA: 0 - 3176447)
I 13:59:30 Verifying Layer 0... (LBA: 0 - 1853279)
I 14:05:10 Verifying Layer 1... (LBA: 1853280 - 3176447)
I 14:08:39 Device MD5: 32ac42c50fab0609aeddbab041a1d4c6
I 14:08:39 Image MD5: 32ac42c50fab0609aeddbab041a1d4c6
I 14:08:39 Operation Successfully Completed! - Duration: 00:09:09
I 14:08:39 Average Verify Rate: 11,571 KB/s (8.4x) - Maximum Verify Rate: 15,675 KB/s (11.3x)
This particular iso was built by a different authoring application, so I also did some later on, where I had the authoring software simply make up dvd folders, and then built the iso in ImgBurn. Same results- it skips the first chapter of the second clip...