Mame Chd May 2026

Input file: game.chd File Version: 5 Logical size: 681,984,000 bytes Hunk Size: 2048 bytes Total Hunks: 332,982 Compression: lzma, flac SHA1: 3b5a... chdman copy -i old.chd -o new.chd -c lzma,flac Create differenced (child) CHD for writable hard disks Parent = read-only base dump. Child stores only changes.

chdman createhd -o base.chd -i base.raw chdman createhd -o child.chd -i base.chd # creates empty child linked to parent Then in MAME, use -hdd child.chd — writes go to child, parent stays pristine. | Format | Compression | Random access | Write support | Audio tracks | MAME support | |--------|-------------|---------------|---------------|--------------|--------------| | CHD v5 | Excellent | Yes | Diff only | Yes (FLAC) | Native | | ISO | None | Yes | No | No | Yes | | BIN/CUE | None | No (needs index) | No | Raw PCM | Yes | | GDI | None | No | No | Raw PCM | Via CHD | | NRG/MDF | Poor | Partial | No | Partial | Limited | mame chd

For further reference, see: docs/chd.txt inside MAME source distribution. Official MAME documentation: mamedev.org Input file: game