GD-ROM Dumping Guide

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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-ROM''' dumping guide. See [[GD-R Dumping Guide|here]] for information about dumping GD-R (recordable) discs.
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==What are GDs?==
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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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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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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 logo 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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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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==Tools==
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==LD Area==
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First you need to make sure you have the necessary equipment. To dump a GD you need:
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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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* A Windows PC
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'''Dumping'''
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* [[DiscImageCreator: Optical Disc Drive Compatibility#GD-Rom|Compatible drive(s)]]
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* A Pin or Paperclip for the disc ejection hole on the Disc Drive
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* [https://github.com/saramibreak/DiscImageCreator/releases DiscImageCreator app]
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* Create an Audio Trap Disc:
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*# Get a blank CD-R or CD-RW disc
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*# Download this free burning app: [https://www.redfox.bz/en/clonecd.html CloneCD] (CDmage and Alcohol 120% also work)
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*# Burn this [https://archive.org/download/audio-trap-disc/audio-trap-disc.zip disc image] to the CD-R/RW
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==Dumping the LD area==
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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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The LD Area should be dumped with DICUI using this guide: [[Disc Dumping Guide (DICUI)]].
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The LD Area is a standard CD-Rom, so it will be the only data to appear when mounted in a computer.
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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 the HD area==
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'''Dumping'''
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* Insert the audio Trap Disc to an HD Area [[DiscImageCreator:_Optical_Disc_Drive_Compatibility#GD-Rom|compatible drive]].
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* Open command line interface app
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* Run below. (stop spinning disc) DiscImageCreator.exe stop [DriveLetter]
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* cd (change directory) to the location of the dreamdump app.
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* use a pin to press the escape eject button, so the tray will eject (or remove the drive cover).
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* Dump with the following command: dreamdump disc --drive="[drive letter]" --image-name=""
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* insert the gdrom and gently push the tray back (or put the drive cover back on).
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* run below. (start rippping gdrom) DiscImageCreator.exe gd [DriveLetter] foo.bin [DriveSpeed(0-72)]
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* The only error saved from the _mainError.txt file is this one:
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*** LBA[045000, 0x0afc8]: [F:ExecSearchingOffset][L:110]
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*** Opcode: 0xbe
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***  ScsiStatus: 0x02 = CHECK_CONDITION
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***  SenseData Key-Asc-Ascq: 05-24-00 = ILLEGAL_REQUEST - INVALID FIELD IN CDB
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** lpCmd: be, 04, 00, 00, af, c8, 00, 00, 01, f8, 04, 00
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** dwBufSize: 2448
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==Submitting your dump info==
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[[Category:Dumping Guides]]
[[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=""
Retrieved from "http://wiki.redump.org/index.php?title=GD-ROM_Dumping_Guide"
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