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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</span>
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</div>
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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 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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'''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've got a GD. What now?==
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'''Dumping'''
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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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* A Windows PC
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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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* [[GD Dumping Guide#Compatible drives|Compatible drive(s)]]
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* An empty CD-R or CD-RW disc
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* [https://github.com/saramibreak/DiscImageCreator/releases DiscImageCreator]
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* [http://www.mediafire.com/?2nygv2oyzzz Trap Disc]
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*
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==Dumping the LD area==
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==HD Area==
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This is the easy part. Make sure you have a [[GD Dumping Guide#Compatible drives|compatible drive]] with [http://www.skcj.co.jp/discon/download/index.html the latest firmware] and have downloaded [https://github.com/saramibreak/DiscImageCreator/releases DiscImageCreator].
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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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# Open up the folder where you downloaded DiscImageCreator (DIC).
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'''Dumping'''
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# Extract the DIC zip into a new folder.
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* Open command line interface app
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# Enter the folder in which you extracted DIC and open the '''Release_ANSI''' folder.
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* cd (change directory) to the location of the dreamdump app.
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# Hold '''Shift''' and '''right-click''' anywhere in the folder. Select '''Open PowerShell window here''' from the drop-down menu.
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* Dump with the following command: dreamdump disc --drive="[drive letter]" --image-name=""
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# Make a mental note of how the DIC commandline looks. The general command is '''.\DiscImageCreator.exe <span style="color:#00FF00">cd</span> <span style="color:#FF0000">d</span> "DumpFolder\DumpName.bin" <span style="color:#0000FF">8</span> /c2''' where the green text indicates that it is a CD we're dumping (which is what we want for the LD area, so leave it as '''cd'''), the red text indicates which drive letter your drive has (in this case it's located at '''D:\''') and the blue text indicates the drive speed (here it's set at '''eight times''' the speed.)
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# Now type in the command that is relevant to your disc into the '''command window''' you opened before. For example, if you were to dump a copy of '''DreamKey from drive F:\''', the command would be something like '''.\DiscImageCreator.exe cd f "DreamKey\DreamKeyLD.bin" 8 /c2'''.
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# Press '''Enter''' and the dumping will begin.
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# After a while the dump should be finished and you can move on to dumping the HD area.
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==Dumping the HD area==
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# First of all you need a so-called "trap disc". This is a disc that will trick your drive to read the otherwise unreadable HD area. Create the disc by burning the [http://www.mediafire.com/?2nygv2oyzzz trap disc CCD image] with either [https://www.redfox.bz/en/clonecd.html CloneCD] or [http://www.alcohol-soft.com/ Alcohol 120%] onto a blank CD-R/RW.
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==Submitting your dump info==
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==Compatible drives==
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GDs are strange in that they contain two distinctly different areas of data. What this means to you is that you will have to dump the disc's LD and HD area separately. Unfortunately, this also means that you '''will need special hardware'''.
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For dumping the '''LD area''', the same rules apply as in dumping a CD, as they use the same technology. A list of compatible drives for dumping LD area is found below (and a more up-to-date list can be found in the [[CD Dumping Guide (Disc Image Creator)|CD Dumping Guide]].)
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{| class="wikitable sortable"
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! Brand        || Model
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|-
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| Plextor      || PX-704
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|-
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| Plextor      || PX-708
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|-
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| Plextor      || PX-712
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|-
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| Plextor      || PX-714
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|-
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| Plextor      || PX-716
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|-
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| Plextor      || PX-755
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|-
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| Plextor      || PX-760
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|-
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| Plextor      || Premium
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|-
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| Plextor      || Premium2
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|-
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| Plextor      || PX-4012
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|-
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| Plextor      || PX-4824
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|-
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| Plextor      || PX-W5224
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|-
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| Plextor      || PX-W4220T
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|-
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| Plextor      || PX-32TS
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|-
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| Plextor      || PX-32CS
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|-
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| Plextor      || PX-83CS
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|-
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| Plextor      || PX-85CS
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|-
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| Plextor      || PX-63CS
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|-
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| Plextor      || PX-65CS
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|-
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| Plextor      || PX-43CS
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|-
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| Plextor      || PX-43CE
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|-
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| Plextor      || PX-43CH
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|-
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| Plextor      || PX-45CS
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|-
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| Plextor      || PX-45CE
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|-
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| Plextor      || PX-45CH
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|-
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| Plextor      || DM-3028
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|-
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| Plextor      || DM-5028
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|-
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| Plextor      || DM-3024
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|-
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| Plextor      || DM-5024
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|-
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| Plextor      || DM-3021
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|-
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| Plextor      || DM-5021
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|-
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| Plextor      || DM-3020
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| Plextor      || DM-5020
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|}
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But for the '''HD area''' the process is different, and you need one of the following drives to dump it:
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{| class="wikitable sortable"
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! Brand            || Model
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|-
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| Lite-On          || LH-18A1H
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|-
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| Lite-On          || SOHD-167T
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|-
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| Plextor          || PX-W4824TA
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|-
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| Plextor          || PX-W4824TU
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|-
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| Samsung TSSTCorp || SH-D162C
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|-
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| Samsung TSSTCorp || SH-D162D
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|-
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| NEC              || CDR-1901A
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|-
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| Lite-On          || LTD-165H
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|-
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| Lite-On          || SOHD-16P9S
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|-
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| Samsung TSSTCorp || TS-H353B
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|-
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| LG              || GCR-8522B
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|-
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| Plextor          || PX-708A
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|-
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| Plextor          || PX-755SA
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|-
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| Samsung TSSTCorp || TS-H353A
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|-
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| Samsung TSSTCorp || TS-H352C
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|-
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| Samsung TSSTCorp || TS-H192C
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|}
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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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