Hello again, thanx for your replies, here is the message I get, so it is probably a multisession BD
Also, below is the log of the Disk (DISK 1) that creates a mds file.
I 13:10:46 ImgBurn Version 2.5.8.0 started!
I 13:10:46 Microsoft Windows 8 Core x64 Edition (6.2, Build 9200)
I 13:10:46 Total Physical Memory: 4.077.204 KiB - Available: 1.997.340 KiB
I 13:10:46 Initialising SPTI...
I 13:10:46 Searching for SCSI / ATAPI devices...
I 13:10:46 -> Drive 1 - Info: HL-DT-ST BDDVDRW CH10LS20 1.00-03 (D:) (SATA)
I 13:10:46 Found 1 BD-ROM/DVD±RW!
I 13:11:13 Operation Started!
I 13:11:13 Building Image Tree...
I 13:11:16 Calculating Totals...
I 13:11:16 Preparing Image...
I 13:11:17 Contents: 24 Files, 15 Folders
I 13:11:17 Content Type: BD Video
I 13:11:17 Data Type: MODE1/2048
I 13:11:17 File System(s): UDF (2.50)
I 13:11:17 Volume Label: 1
I 13:11:17 Size: 8.452.416.020 bytes
I 13:11:17 Sectors: 4.127.172
I 13:11:17 Image Size: 8.453.488.640 bytes
I 13:11:17 Image Sectors: 4.127.680
I 13:11:19 Operation Successfully Completed! - Duration: 00:00:06
I 13:11:19 Operation Started!
I 13:11:19 Image Contents: 24 Files, 15 Folders
I 13:11:19 Image Sectors: 4.127.680 (MODE1/2048)
I 13:11:19 Image Size: 8.453.488.640 bytes
I 13:11:19 Image Volume Identifier: 1
I 13:11:19 Image Volume Set Identifier: 4B136966003EFB44
I 13:11:19 Image Application Identifier: ImgBurn v2.5.8.0
I 13:11:19 Image Implementation Identifier: ImgBurn
I 13:11:19 Image File System(s): UDF (2.50)
I 13:11:19 Destination File: G:\1.ISO
I 13:11:19 Destination Free Space: 837.400.883.200 Bytes (817.774.300,00 KiB) (798.607,71 MiB) (779,89 GiB)
I 13:11:19 Destination File System: NTFS
I 13:11:19 File Splitting: Auto
I 13:11:19 Writing Image...
I 13:22:22 Operation Successfully Completed! - Duration: 00:11:03
I 13:22:22 Average Write Rate: 12.451 KiB/s (2.8x) - Maximum Write Rate: 145.421 KiB/s (33.1x)
For the other DISK, that a mds is NOT created, the Log show pretty much the same....