Just wanted to report this bug. I made an image of 2 session DVD+DL. It seems the image contains session 1 and 2, whereas session 2 usually includes session 1, so session 1 is double.
At least it explains the huge image. The log excerpt below states that session 2 is read from the beginning of the disc.
ImgBurn version: 2.5.5.0
HL-DT-ST DVDRAM GH22NS50 TN01 (SATA)
Current Profile: DVD+R DL
Disc Information:
Status: Complete
State of Last Session: Complete
Erasable: No
Sessions: 2
Sectors: 4.026.304
Size: 8.245.870.592 bytes
Time: 894:46:04 (MM:SS:FF)
File System Information:
Sectors: 4.026.304
Size: 8.245.870.592 bytes
Time: 894:46:04 (MM:SS:FF)
TOC Information:
Session 1... (LBA: 0)
-> Track 01 (Mode 1, LBA: 0 - 3447839)
Session 2... (LBA: 3447840)
-> Track 02 (Mode 1, LBA: 3447840 - 4026303)
-> LeadOut (LBA: 4026304)
Track Information:
Session 1...
-> Track 01 (LTSA: 0, LTS: 3445792, LRA: 0)
Session 2...
-> Track 02 (LTSA: 3447840, LTS: 578464, LRA: 0)
Disc Control Blocks Information:
PLEXTOR PX-B920SA
Physical Format Information (Last Recorded - L0):
Disc ID: MKM-001-00
Book Type: DVD-ROM
Part Version: 1
Disc Size: 120mm
Maximum Read Rate: Not Specified
Number of Layers: 2
Track Path: Opposite Track Path (OTP)
Linear Density: 0.293 um/bit
Track Density: 0.74 um/track
First Physical Sector of Data Area: 196.608
Last Physical Sector of Data Area: 16.433.087
Last Physical Sector in Layer 0: 2.283.519
Physical Format Information (Last Recorded - L1):
Disc ID: MKM-001-00
Book Type: DVD-ROM
Part Version: 1
Disc Size: 120mm
Maximum Read Rate: Not Specified
Number of Layers: 2
Track Path: Opposite Track Path (OTP)
Linear Density: 0.293 um/bit
Track Density: 0.74 um/track
First Physical Sector of Data Area: 196.608
Last Physical Sector of Data Area: 16.433.087
Last Physical Sector in Layer 0: 2.283.519
Layer Information:
Layer 0 Sectors: 2.086.912 (51,83%)
Layer 1 Sectors: 1.939.392 (48,17%)
When reading, the log says:
I 16:05:12 Reading Session 1 of 2... (1 Track, LBA: 0 - 3445791)
I 16:05:12 Reading Track 1 of 1... (MODE1/2048, LBA: 0 - 3445791)
I 16:05:12 Reading Layer 0... (LBA: 0 - 2086911)
I 16:11:09 Reading Layer 1... (LBA: 2086912 - 3445791)
I 16:14:25 Reading Session 2 of 2... (1 Track, LBA: 0 - 578463)
I 16:14:25 Reading Track 1 of 1... (MODE1/2048, LBA: 3447840 - 4026303)
I 16:14:25 Reading Layer 0... (LBA: 0 - 2086911)
I 16:20:18 Reading Layer 1... (LBA: 2086912 - 4026303)
Apart from that, I suggest the READ function should let the user select the session(s) to include in the image OR let the user make an ISO which contains the data as it is shown in Windows: merged. This would not be an 1:1 image, but at least of almost the same size as the disc.