Convert DMG to CDI

Understanding DMG and CDI file formats

DMG is a disk image file format commonly used on macOS systems. It is primarily used for distributing software and disk images, and can contain compressed or encrypted data. CDI stands for DiscJuggler Disc Image, a format used by the DiscJuggler software to create exact copies of CDs and DVDs, often used for Dreamcast games and other disc-based media.

Why convert DMG to CDI?

Converting a DMG file to CDI is typically necessary when you want to use macOS disk images with emulators or hardware that require the CDI format, such as Dreamcast emulators or burning tools that only accept CDI files.

How to convert DMG to CDI

There is no direct, one-step converter for DMG to CDI, but you can achieve the conversion through a two-step process:

1. Convert DMG to ISO: Use a tool like AnyToISO (Windows/macOS) or hdiutil (macOS Terminal) to convert your DMG file to an ISO file.
   Example (macOS Terminal): hdiutil convert source.dmg -format UDTO -o output.iso
2. Convert ISO to CDI: Use DiscJuggler (Windows) or PowerISO to convert the ISO file to CDI format.
   DiscJuggler: Open the program, go to File → New → CD Image to CD Recorder, select your ISO, and choose to save as CDI.

Recommended software for DMG to CDI conversion

• AnyToISO (Windows/macOS): Converts DMG to ISO easily.
• DiscJuggler (Windows): The original software for creating and handling CDI files.
• PowerISO (Windows): Supports a wide range of image formats and can convert ISO to CDI.

Summary

While there is no direct DMG to CDI converter, using AnyToISO or hdiutil to convert DMG to ISO, followed by DiscJuggler or PowerISO to convert ISO to CDI, is the most reliable method. Always verify the integrity of your files after conversion to ensure compatibility with your intended use.