Read mode 'not currently supported' from a single-session disc

[jspraul]

According to the following thread, the reason reading from multi-track discs is blocked is as follows:

 

If you try and read a multisession disc to a single session image, you could/would lose data (files) present in one but not the other.

 

However, this check is implemented incorrectly -- instead of blocking multi-session discs, it blocks all multi-track discs, even when the disc holds only a single session. This design flaw has been in place since v2.5.6, released back in 2012. The fix was also hinted at in the same forum thread:

 

I might be able to add an exception for layouts like that but I'm not sure I have the means to create such a disc that I could use for testing.

 

Hardware DVD recorders finalize in a multi-track format even when they are used to record only a single session on a disc (generating a menu that is included even for the one session). Here is another example of the ImgBurn disc info box for this type of disc:

PLDS DVD+-RW DH-16ACS JD11 (SATA)
Current Profile: DVD-R

Disc Information:
Status: Complete
State of Last Session: Complete
Erasable: No
Sessions: 1
Sectors: 1,949,584
Size: 3,992,748,032 bytes
Time: 433:16:34 (MM:SS:FF)
MID: MCC 02RG20
Supported Read Speeds: 2x, 4x, 6x, 8x, 12x, 16x
Current Read Speed: 6x

TOC Information:
Session 1... (LBA: 0)
-> Track 01  (Mode 1, LBA: 0 - 1949583)
-> LeadOut  (LBA: 1949584)

Track Information:
Session 1...
-> Track 01 (LTSA: 0, LTS: 16128, LRA: 767)
-> Track 02 (LTSA: 16144, LTS: 224, LRA: 16367)
-> Track 03 (LTSA: 16384, LTS: 1933168, LRA: 1949551)
-> Track 04 (LTSA: 1949568, LTS: 16, LRA: 1949583)

Pre-recorded Information:
Manufacturer ID: MCC 02RG20

Recording Management Area Information:
FUNAI L61A9030907BOK+- DVD-RW DD-DRA

Physical Format Information (Last Recorded):
Book Type: DVD-R
Part Version: 5
Disc Size: 120 mm
Maximum Read Rate: Not Specified
Number of Layers: 1
Track Path: Parallel Track Path (PTP)
Linear Density: 0.267 um/bit
Track Density: 0.74 um/track
First Physical Sector of Data Area: 196,608
Last Physical Sector of Data Area: 2,146,191
Last Physical Sector in Layer 0: 0

I have used IsoBuster to read an image from this disc, but ImgBurn fails to open it with the following error dialog:

---------------------------
ImgBurn
---------------------------
Minutes out of range!
---------------------------
OK   
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The .CUE IsoBuster created for the 3,992,748,032-byte binary dvd image file (no extension?) is:

FILE "20150301-original" BINARY

REM ORIGINAL MEDIA-TYPE: DVD-R

  REM SESSION 01        ; Not supported by other applications (*)
    TRACK 01 MODE1/2048
      INDEX 01 00:00:00
      REM MSF: 00:00:00 = LBA: 0
    TRACK 02 MODE1/2048
      INDEX 00 03:35:03
      REM MSF: 03:35:03 = LBA: 16128
      INDEX 01 03:35:19
      REM MSF: 03:35:19 = LBA: 16144
    TRACK 03 MODE1/2048
      INDEX 00 03:38:18
      REM MSF: 03:38:18 = LBA: 16368
      INDEX 01 03:38:34
      REM MSF: 03:38:34 = LBA: 16384
    TRACK 04 MODE1/2048
      INDEX 00 433:14:02
      REM MSF: 433:14:02 = LBA: 1949552
      INDEX 01 433:14:18
      REM MSF: 433:14:18 = LBA: 1949568

REM (*) SESSION directives are unfortunately not properly supported
REM     'out there'.  IsoBuster however supports them !

Due to my unfamiliarity with ImgBurn features, a visit to the forums was necessary to find other threads giving the work-around to add the DVD drive root in build mode. The error message currently reads:

---------------------------
ImgBurn
---------------------------
Sorry, using Read mode to create an image file from a multi-track DVD-R disc is not currently supported.



Instead, use Build mode to create a new 'clean' image based on the contents of the disc.
---------------------------
OK   
---------------------------

I propose changing this to act like the helpful auto-volume-label popup, offering to switch modes and add the source:

Sorry, using Read mode to create an image file from a multi-track DVD-R disc could cause data loss.

Would you like to use Build mode to create an image including only the most recent session?