[Problem] Double Layer DVD Disc gets detected as Single Layer #403

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opened 2026-01-29 16:15:50 +00:00 by claunia · 1 comment

claunia commented 2026-01-29 16:15:50 +00:00

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Originally created by @FoxhackDN on GitHub (Feb 7, 2022).

Originally assigned to: @mnadareski on GitHub.

Version
What version are you using?

• Stable release 2.3

Build
What runtime version are you using?

• .NET Framework 4.8 running on Windows 10

Describe the issue
I dumped The Penguins of Madagascar DVD [ http://redump.org/disc/87134/ ] to verify the disc, and it worked fine, but when I went to add the ringcode info, it only showed me enough fields for a single layer disc (Data and Label.)

The disc itself is 2.6GB, but it's a double layer disc for some reason. This is correctly detected by DiscImageCheck, and it's listed in the _disc.txt log.

I assume you're using the disc size to determine if the disc has more than one layer, which makes sense.

To Reproduce
Steps to reproduce the behavior:

1. Dump Penguins of Madagascar DVD disc
2. That's it, really

Expected behavior
I expected the ring screen to have enough fields for both layers.

Screenshots

Additional context
Aaru media info:

F:\aaru-5.3.0_windows_x64>aaru media info g:
aaru 5.3.0
Copyright c 2011-2021 Natalia Portillo

Media has 1303978 blocks of 2048 bytes/each. (for a total of 2.487 GiB)
PFI:
Disc is a 120mm DVD-ROM version 1
Disc claims conformation to ECMA-267
Disc maximum transfer rate is 10,08 Mbit/sec.
Disc has 2 layers
Layers are in opposite track path
Pitch size is 0,147 µm/bit
Track size is 0,74 µm
Data area starts at PSN 30000h
Data area ends at PSN F7B7A9h
Layer 0 ends at PSN F96FFh

Lead-In CMI:
Disc is encrypted using CSS or CPPM.
Disc can be played in the following regions: 1
Media identified as DVDROM

DIC _disc.txt contents (abridged):

========== DiscStructure ==========
FormatCode: 00, Sendable:  No, Readable: Yes
FormatLength: 2052
========== PhysicalFormatInformation ==========
	       BookVersion: 1
	          BookType: DVD-ROM
	       MinimumRate: 10.08 Mbps
	          DiskSize: 120mm
	         LayerType: Layer contains embossed data
	         TrackPath: Opposite Track Path
	    NumberOfLayers: Double Layer
	      TrackDensity: 0.74um/track
	     LinearDensity: 0.293um/bit
	StartingDataSector:  196608 (0x30000)
	     EndDataSector: 16234409 (0xf7b7a9)
	EndLayerZeroSector: 1021695 (0xf96ff)
	           BCAFlag: No

Originally created by @FoxhackDN on GitHub (Feb 7, 2022). Originally assigned to: @mnadareski on GitHub. **Version** What version are you using? - [ ] Stable release 2.3 **Build** What runtime version are you using? - [ ] .NET Framework 4.8 running on Windows 10 **Describe the issue** I dumped The Penguins of Madagascar DVD [ http://redump.org/disc/87134/ ] to verify the disc, and it worked fine, but when I went to add the ringcode info, it only showed me enough fields for a single layer disc (Data and Label.) The disc itself is 2.6GB, but it's a double layer disc for some reason. This is correctly detected by DiscImageCheck, and it's listed in the _disc.txt log. I assume you're using the disc size to determine if the disc has more than one layer, which makes sense. **To Reproduce** Steps to reproduce the behavior: 1. Dump Penguins of Madagascar DVD disc 2. That's it, really **Expected behavior** I expected the ring screen to have enough fields for both layers. **Screenshots**  **Additional context** Aaru media info: ``` F:\aaru-5.3.0_windows_x64>aaru media info g: aaru 5.3.0 Copyright c 2011-2021 Natalia Portillo Media has 1303978 blocks of 2048 bytes/each. (for a total of 2.487 GiB) PFI: Disc is a 120mm DVD-ROM version 1 Disc claims conformation to ECMA-267 Disc maximum transfer rate is 10,08 Mbit/sec. Disc has 2 layers Layers are in opposite track path Pitch size is 0,147 µm/bit Track size is 0,74 µm Data area starts at PSN 30000h Data area ends at PSN F7B7A9h Layer 0 ends at PSN F96FFh Lead-In CMI: Disc is encrypted using CSS or CPPM. Disc can be played in the following regions: 1 Media identified as DVDROM ``` DIC _disc.txt contents (abridged): ``` ========== DiscStructure ========== FormatCode: 00, Sendable: No, Readable: Yes FormatLength: 2052 ========== PhysicalFormatInformation ========== BookVersion: 1 BookType: DVD-ROM MinimumRate: 10.08 Mbps DiskSize: 120mm LayerType: Layer contains embossed data TrackPath: Opposite Track Path NumberOfLayers: Double Layer TrackDensity: 0.74um/track LinearDensity: 0.293um/bit StartingDataSector: 196608 (0x30000) EndDataSector: 16234409 (0xf7b7a9) EndLayerZeroSector: 1021695 (0xf96ff) BCAFlag: No ```

claunia added the bug label 2026-01-29 16:15:50 +00:00

claunia closed this issue 2026-01-29 16:15:50 +00:00

claunia commented 2026-01-29 16:15:51 +00:00

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@mnadareski commented on GitHub (Feb 7, 2022):

Self-reminder: line.Split

@mnadareski commented on GitHub (Feb 7, 2022): Self-reminder: `line.Split`

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Reference: SabreTools/MPF#403