GD-ROM Dumping Guide

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'''GD-ROM''' dumping guide. See [[GD-R Dumping Guide|here]] for information about dumping GD-R (recordable) discs.
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<span style="font-size: 18px; font-weight: bold;">WORK IN PROGRESS
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This is a step-by-step guide designed to be easy to follow so that you can make reproducible, good dumps of your GDs to the Redump standard.
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GD discs were used by the Sega Dreamcast console and Sega NAOMI, Sega NAOMI 2, Sega Chihiro, and Triforce arcade systems.
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==What are GDs?==
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The discs contain two distinct areas, a Low Density Area ("LD Area") and a High Density Area ("HD Area"), physically separated by a [https://en.wikipedia.org/wiki/GD-ROM#/media/File:Gdrom.jpg ring]. You'll need to dump both areas of the disc, each requiring different drive models and methods.
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GDs—or Gigadiscs—are the type of [[wikipedia:Optical disc|optical media]] used by the [[wikipedia:Dreamcast|Sega Dreamcast]] as well as the [https://segaretro.org/Sega_NAOMI Sega NAOMI], [https://segaretro.org/Sega_NAOMI_2 Sega NAOMI 2], [https://segaretro.org/Sega_Chihiro Sega Chihiro] and [https://segaretro.org/Triforce Triforce] arcade systems. It is special compared to its relative—the CD—in that it contains both a low density (LD) and a high density (HD) area. To get a good dump, you need to extract them both from the disc.
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==How do I know if I have a GD?==
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==LD Area==
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If you have any of the officially released discs for the Dreamcast or any of the above mentioned arcade systems, you are pretty much guaranteed to have a GD. The Dreamcast did however support loading of [[wikipedia:MIL-CD|MIL-CDs]], which lead to a number of unlicensed software being pressed on regular CDs. Check for the GD-ROM mark on the disc or check the reflective side of the disc for a visible LD–HD divide if you are unsure.
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'''Tools'''
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* [[Optical Disc Drive Compatibility: CD|CD-ROM compatible disc drive]]
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* Windows, Linux, or macOS computer
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* [https://github.com/SabreTools/MPF/releases MPF application] (includes Redumper)
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==So I got a GD, what now?==
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'''Dumping'''
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The LD Area is formatted like a standard CD-ROM, so should be dumped using the standard [[Disc Dumping Guide (MPF)]]. The CD-ROM profile should be selected in MPF.
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==HD Area==
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'''Tools'''
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* [[Optical Disc Drive Compatibility: GD-ROM|GD-ROM compatible disc drive]]
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* Windows or Linux computer
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* [https://github.com/MoriGM/dreamdump/releases dreamdump app]
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'''Dumping'''
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* Open command line interface app
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* cd (change directory) to the location of the dreamdump app.
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* Dump with the following command: dreamdump disc --drive="[drive letter]" --image-name=""
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[[Category:Dumping Guides]]

Latest revision as of 03:50, 19 February 2026

GD-ROM dumping guide. See here for information about dumping GD-R (recordable) discs.

GD discs were used by the Sega Dreamcast console and Sega NAOMI, Sega NAOMI 2, Sega Chihiro, and Triforce arcade systems.

The discs contain two distinct areas, a Low Density Area ("LD Area") and a High Density Area ("HD Area"), physically separated by a ring. You'll need to dump both areas of the disc, each requiring different drive models and methods.

LD Area

Tools

Dumping

The LD Area is formatted like a standard CD-ROM, so should be dumped using the standard Disc Dumping Guide (MPF). The CD-ROM profile should be selected in MPF.

HD Area

Tools

Dumping

  • Open command line interface app
  • cd (change directory) to the location of the dreamdump app.
  • Dump with the following command: dreamdump disc --drive="[drive letter]" --image-name=""
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