Here's the info from the disc that does work.
MATSHITA DVD-RAM UJ-841S 1.60 (ATA)
Current Profile: DVD+R DL
Disc Information:
Status: Complete
Erasable: No
Sessions: 1
Sectors: 3,974,496
Size: 8,139,767,808 bytes
Time: 883:15:21 (MM:SS:FF)
TOC Information:
Session 1... (LBA: 0)
-> Track 01 (Mode 1, LBA: 0 - 3974495)
-> LeadOut (LBA: 3974496)
Track Information:
Session 1...
-> Track 01 (LTSA: 0, TS: 3974496, LRA: 0)
Disc Control Blocks Information:
SONY DVD RW DRU-8
Physical Format Information (ADIP):
Disc ID: MKM-001-00
Book Type: DVD+R DL
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: 16,580,607
Last Physical Sector in Layer 0: 2,283,519
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: 16,580,607
Last Physical Sector in Layer 0: 2,183,855
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: 16,580,607
Last Physical Sector in Layer 0: 2,183,855
Layer Information:
Layer 0 Sectors: 1,987,248 (50%)
Layer 1 Sectors: 1,987,248 (50%)