CHD files are treated as regular disc images. Use Load Content → select the .chd file directly. Part 6: Advanced Tips & Performance Optimization Compression Levels chdman offers different compression algorithms. The default ( -c cdlz (CD LZMA) ) is best for speed/size. For maximum compression (slowest):
Absolutely none. CHD uses lossless compression for game data and lossless FLAC for CD audio. Your game will be bit-for-bit identical to the original disc. Convert Zip To Chd
For arcade games (MAME .zip ROM sets), no . Arcade ROMs are separate chip dumps, not disc images. CHD is for hard disks, CDs, and DVDs . Keep your MAME arcade ROMs as ZIPs. CHD files are treated as regular disc images