Even a perfect format has quirks. Here are solutions to frequent problems.
Overview
Enable seamless loading, compression, and management of PlayStation 1 disc images in CHD (Compressed Hunks of Data) format, reducing file size while preserving full gameplay and audio accuracy.
Key Benefits
Technical Integration (for a frontend/tool) chd psx roms
| Capability | Implementation |
|------------|----------------|
| Auto‑convert | Batch convert existing .bin/.cue to .chd using chdman (MAME tool) |
| Playlist support | Read .chd metadata (track count, game title, disc number) from internal header |
| Multi‑disc handling | Group .chd files into a single game entry with disc index (Disc 1/2/3) |
| Checksum scanning | Generate SHA‑1 / CRC32 from compressed data for ROM database matching |
| Save state compatibility | Store save states externally; CHD remains read‑only, avoiding corruption |
Example Workflow (User)
Edge Cases Handled
chdman is part of the MAME tool suite. You do not need MAME to run it.
Download: Get the latest MAME binaries from the official MAME dev site. Alternative: Use a GUI wrapper like CHDMAN GUI.
Solution: You cannot convert a lone BIN to CHD without knowing the sector layout. Use a tool like CueMaker or ISOBuster to regenerate the CUE sheet from the BIN file. Even a perfect format has quirks
CHD stands for Compressed Hunks of Data. It was originally developed by MAME (Multiple Arcade Machine Emulator) developers to compress large arcade hard drives and CD-ROM images. Unlike standard ZIP or RAR compression (which require full extraction to RAM before playing), CHD is a lossless, chunk-level compression format.
For PSX games, a standard .bin file (raw disc image) is exactly 2352 bytes per sector, regardless of whether the sector contained actual game data or blank padding. A .chd file analyzes these hunks, removes redundant padding, and compresses the actual data.
Most modern emulators support CHD files natively without the need to extract them. Technical Integration (for a frontend/tool) | Capability |