Hi,
many thanks for Your help
Before burning my image I didn't try bitsettings since I had "change booktype automatically" flagged in Imgburn and thought that in any case device firmware would have done it automatically.
Here the log:
I 11:24:23 ImgBurn Version 2.5.6.0 started!
I 11:24:23 Microsoft Windows 7 Professional x64 Edition (6.1, Build 7601 : Service Pack 1)
I 11:24:23 Total Physical Memory: 8.386.616 KB - Available: 6.375.796 KB
I 11:24:23 Initialising SPTI...
I 11:24:23 Searching for SCSI / ATAPI devices...
I 11:24:23 -> Drive 1 - Info: DTSOFT BDROM 1.05 (I:) (Virtual)
I 11:24:23 -> Drive 2 - Info: SAMSUNG DVDWBD SH-B083L SB01 (F:) (ATA)
I 11:24:23 -> Drive 3 - Info: GFEV O52ZGTQJSLMF 1.04 (G:) (SCSI)
I 11:24:23 Found 2 BD-ROMs and 1 BD-ROM/DVD±RW!
I 11:28:47 Operation Started!
I 11:28:47 Source File: E:\DVD4.MDS
I 11:28:47 Source File Sectors: 4.119.808 (MODE1/2048)
I 11:28:47 Source File Size: 8.437.366.784 bytes
I 11:28:47 Source File Volume Identifier: DVD4
I 11:28:47 Source File Volume Set Identifier: 40DB5948003EDCF0
I 11:28:47 Source File Application Identifier: IMGBURN V2.5.6.0 - THE ULTIMATE IMAGE BURNER!
I 11:28:47 Source File Implementation Identifier: ImgBurn
I 11:28:47 Source File File System(s): ISO9660; UDF (1.02)
I 11:28:47 Destination Device: [2:0:0] SAMSUNG DVDWBD SH-B083L SB01 (F:) (ATA)
I 11:28:47 Destination Media Type: DVD+R DL (Disc ID: MKM-003-00)
I 11:28:47 Destination Media Supported Write Speeds: 4x; 6x; 8x
I 11:28:47 Destination Media Sectors: 4.173.824
I 11:28:47 Write Mode: DVD
I 11:28:47 Write Type: DAO
I 11:28:47 Write Speed: MAX
I 11:28:47 Link Size: Auto
I 11:28:47 Lock Volume: Yes
I 11:28:47 Test Mode: No
I 11:28:47 OPC: No
I 11:28:47 BURN-Proof: Enabled
I 11:28:47 Write Speed Successfully Set! - Effective: 11.080 KB/s (8x)
I 11:28:47 Optimal L0 Data Zone Capacity: 2.059.904
I 11:28:47 Optimal L0 Data Zone Method: Copied From Original Disc
I 11:29:03 Set L0 Data Zone Capacity Succeeded!
I 11:29:03 Filling Buffer... (40 MB)
I 11:29:04 Writing LeadIn...
I 11:29:05 Writing Session 1 of 1... (1 Track, LBA: 0 - 4119807)
I 11:29:05 Writing Track 1 of 1... (MODE1/2048, LBA: 0 - 4119807)
I 11:29:05 Writing Layer 0... (LBA: 0 - 2059903)
I 11:38:03 Writing Layer 1... (LBA: 2059904 - 4119807)
I 11:47:01 Synchronising Cache...
I 11:47:03 Closing Track...
I 11:47:04 Finalising Disc...
I 11:47:44 Exporting Graph Data...
I 11:47:44 Graph Data File: C:\Users\adc\AppData\Roaming\ImgBurn\Graph Data Files\SAMSUNG_DVDWBD_SH-B083L_SB01_MERCOLEDÌ-27-GIUGNO-2012_11-28_MKM-003-00_MAX.ibg
I 11:47:44 Export Successfully Completed!
I 11:47:44 Operation Successfully Completed! - Duration: 00:18:56
I 11:47:44 Average Write Rate: 7.664 KB/s (5.5x) - Maximum Write Rate: 11.211 KB/s (8.1x)
I 11:47:44 Cycling Tray before Verify...
W 11:47:52 Waiting for device to become ready...
I 11:48:09 Device Ready!
I 11:48:15 Operation Started!
I 11:48:15 Source Device: [2:0:0] SAMSUNG DVDWBD SH-B083L SB01 (F:) (ATA)
I 11:48:15 Source Media Type: DVD+R DL (Book Type: DVD+R DL) (Disc ID: MKM-003-00)
I 11:48:15 Source Media Supported Write Speeds: 4x; 6x; 8x
I 11:48:15 Image File: E:\DVD4.MDS
I 11:48:15 Image File Sectors: 4.119.808 (MODE1/2048)
I 11:48:15 Image File Size: 8.437.366.784 bytes
I 11:48:15 Image File Volume Identifier: DVD4
I 11:48:15 Image File Volume Set Identifier: 40DB5948003EDCF0
I 11:48:15 Image File Application Identifier: IMGBURN V2.5.6.0 - THE ULTIMATE IMAGE BURNER!
I 11:48:15 Image File Implementation Identifier: ImgBurn
I 11:48:15 Image File File System(s): ISO9660; UDF (1.02)
I 11:48:15 Read Speed (Data/Audio): MAX / MAX
I 11:48:17 Verifying Session 1 of 1... (1 Track, LBA: 0 - 4119807)
I 11:48:17 Verifying Track 1 of 1... (MODE1/2048, LBA: 0 - 4119807)
I 11:48:17 Verifying Layer 0... (LBA: 0 - 2059903)
I 11:54:52 Verifying Layer 1... (LBA: 2059904 - 4119807)
I 12:01:09 Exporting Graph Data...
I 12:01:09 Graph Data File: C:\Users\adc\AppData\Roaming\ImgBurn\Graph Data Files\SAMSUNG_DVDWBD_SH-B083L_SB01_MERCOLEDÌ-27-GIUGNO-2012_11-28_MKM-003-00_MAX.ibg
I 12:01:09 Export Successfully Completed!
I 12:01:09 Operation Successfully Completed! - Duration: 00:12:52
I 12:01:09 Average Verify Rate: 10.700 KB/s (7.7x) - Maximum Verify Rate: 25.138 KB/s (18.2x)
I 12:01:40 Close Request Acknowledged
I 12:01:40 Closing Down...
I 12:01:40 Shutting down SPTI...
Following Your suggestion I installed now latest 2.5.7.0, inserted blank DVD+R medium (I have no more DL), tried "manual" bitsetting and ImgBurn reported "Success"
So the question is: is it really changed to DVD-ROM booktype ?
Why this wasn't done automatically by ImgBurn and/or device firmware ?
Many thanks for Your support
L.