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CHD (Compressed Hunks of Data) is a lossless compression format primarily used for arcade games (MAME) and some disc-based systems. PSX (PlayStation 1) games are typically distributed as bin/cue or ISO files, not CHD—though CHD can be used to compress PlayStation disc images.

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3. The Modding Scene (CHD-specific Builds)

A rising trend is modders distributing their projects as CHDs. Because CHD is a single container file (unlike the fragmented bin/cue), modders can alter the structure of the game—adding new FMVs or re-arranging the file system—and ensure the end-user burns CHD (Compressed Hunks of Data) is a lossless

• LZMA (Lempel-Ziv-Markov chain algorithm) for high compression.
• FLAC (Free Lossless Audio Codec) specifically for CD-DA audio tracks.
• Hunk-based compression: The disc is divided into "hunks" (typically 2–8 sectors per hunk), allowing random access without decompressing the entire file.

6. Limitations and Caveats

6.1 Incompatible Use Cases

• CD burning to physical media: Cannot burn a CHD directly to a CD-R. Must extract back to bin/cue.
• PS1 digital storefronts (PSN): Sony’s official .pkg format is incompatible.
• Some mobile emulators (e.g., FPse for Android older than v1.0.40): Lack CHD support.

• Compression: CHD often reduces file size compared to raw BINs, especially for Red Book audio or redundant data.
• Integrity: CHD includes checksums that help detect corruption.
• Emulation convenience: Some emulators (or frontends) support CHD natively and can mount or stream CHD images efficiently.
• Archival fidelity: CHD can store full sector information (including uncommon layouts), making it suitable for preservation.