Compressed Hunks of Data

File Format
Name	Compressed Hunks of Data
Ontology	Electronic File Formats Disk Image Formats Compressed Hunks of Data
Extension(s)	.chd
Released	2007

CHD (Compressed Hunks of Data) is a lossless compression format originally developed for MAME (which in turn originally stood for Multiple Arcade Machine Emulator), for the hard-drive contents of certain arcade machines. It has since been used in several other emulators as a means of storing CD-ROM game data. For CD-based games, it compresses the contents of a disc image (e.g. .cue + .bin files) to a single .chd file.

Examples

Create a chd from cue file (bin file must also be accessible):

 chdman createcd -i example.cue -o example.chd

Links

• MAME project page
• chd.h - GitHub