DVD-R book type changes to DVD-RW after burning

[plastikat]

Hi, All.
I was wondering if anyone here could help me to figure out the reasons behind the subject... I've tried searching the Net for answers  to no avail.
 
A bit more detailed description follows. I've got a NEC DVD-RW ND-3520AW drive with the latest firmware (3.07). I burn a Verbatim DVD-R 4.7GB disk (MCC 03RG20) using the latest ImgBurn (2.5.8.0). Before the burn I get this drive/disk information (under the spoiler to not clutter things up):

 

_NEC DVD_RW ND-3520AW 3.07 (RAID)
Current Profile: DVD-R

Disc Information:
Status: Empty
State of Last Session: Empty
Erasable: No
Free Sectors: 2 297 888
Free Space: 4 706 074 624 bytes
Free Time: 510:40:38 (MM:SS:FF)
Next Writable Address: 0
MID: MCC 03RG20
Supported Write Speeds: 2x; 4x; 6x; 8x; 12x; 16x

Pre-recorded Information:
Manufacturer ID: MCC 03RG20

Physical Format Information (Last Recorded):
Disc ID: 0@P-!-00
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: 2 495 103
Last Physical Sector in Layer 0: 0

Performance (Write Speed):
Descriptor 1...
-> B0: 0x00; B1: 0x00; B2: 0x00; B3: 0x00
-> EL: 2297888 (0x00231020)
-> RS: 6 925 KB/s (5x) - WS: 2 770 KB/s (2x)
Descriptor 2...
-> B0: 0x00; B1: 0x00; B2: 0x00; B3: 0x00
-> EL: 2297888 (0x00231020)
-> RS: 6 925 KB/s (5x) - WS: 5 540 KB/s (4x)
Descriptor 3...
-> B0: 0x00; B1: 0x00; B2: 0x00; B3: 0x00
-> EL: 2297888 (0x00231020)
-> RS: 11 080 KB/s (8x) - WS: 8 310 KB/s (6x)
Descriptor 4...
-> B0: 0x00; B1: 0x00; B2: 0x00; B3: 0x00
-> EL: 2297888 (0x00231020)
-> RS: 11 080 KB/s (8x) - WS: 11 080 KB/s (8x)
Descriptor 5...
-> B0: 0x03; B1: 0x00; B2: 0x00; B3: 0x00
-> EL: 2297888 (0x00231020)
-> RS: 16 620 KB/s (12x) - WS: 16 620 KB/s (12x)
Descriptor 6...
-> B0: 0x03; B1: 0x00; B2: 0x00; B3: 0x00
-> EL: 2297888 (0x00231020)
-> RS: 22 160 KB/s (16x) - WS: 22 160 KB/s (16x)

 

 

The most important detail to spot is "Current Profile: DVD-R". And after the burn (and cycling the drive) I then get this information:

_NEC DVD_RW ND-3520AW 3.07 (RAID)
Current Profile: DVD-RW

Disc Information:
Status: Complete
State of Last Session: Complete
Erasable: Yes
Sessions: 1
MID: MCC 03RG20

TOC Information:
Session 1... (LBA: 0)
-> Track 01  (Mode 1, LBA: 0 - 2297887)
-> LeadOut  (LBA: 2297888)

Pre-recorded Information:
Manufacturer ID: MCC 03RG20

Recording Management Area Information:
_NEC DVD_RW ND-3520AW

Physical Format Information (Last Recorded):
Disc ID: 0@P-!-00
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: 2 209 615
Last Physical Sector in Layer 0: 0

Format Capacities:
DT: 0x02 - NB: 0 (0x00000000) - TDP: 2048
FT: 0x00 - NB: 2297888 (0x00231020) - TDP: 2048
FT: 0x10 - NB: 2297888 (0x00231020) - TDP: 16
FT: 0x15 - NB: 2297888 (0x00231020) - TDP: 16

 

And so now I get "Current Profile: DVD-RW". It's not just weird, it also has some bad side-effects... One of these being I can't burn and then verify, because when I do so the verification fails with the following messages:

Session 1, Track 1 is smaller on the disc than it is in the image file.
Disc's Track Sectors: 1 (TOC Sectors: 1)
Image File's Track Sectors: 2013008 (TOC Sectors: 2013008)

And this is kinda showstopper for me, because I believe verification is a must... Also Verbatim DVD+R's retain their book type after being burned under same conditions (and get verified). So the questions I hope someone can shed some light on are:

 

- Is this behavior considered expected for DVD-R's? If so, then how do people get these verified?

- Could it be this behavior is specific to Verbatim DVD-R's and some other DVD-R's would not behave the same?

- Could it be some bugs of my drive are the cause?

- Could it be some bugs in ImgBurn are the cause?

- Are there any settings in ImgBurn I can try to adjust to avoid this behavior?

- Something else I can't even guess?

 

Any help would be greatly appreciated. Thanks in advance.