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# chdman
> Manage and convert CHD (Compressed Hunks of Data) images.
> Commonly used with MAME and retro game images.
> More information: <https://docs.mamedev.org/tools/chdman.html>.
- Create a CHD from a BIN/CUE pair (CD-ROM image):
`chdman createcd {{[-i|--input]}} {{path/to/file.cue}} {{[-o|--output]}} {{path/to/file.chd}}`
- Create a CHD from a raw hard drive image:
`chdman createhd {{[-i|--input]}} {{path/to/disk.img}} {{[-o|--output]}} {{path/to/disk.chd}}`
- Extract (decompress) a CHD back to BIN/CUE:
`chdman extractcd {{[-i|--input]}} {{path/to/file.chd}} {{[-o|--output]}} {{path/to/file.cue}}`
- Verify integrity of CHD file:
`chdman verify {{[-i|--input]}} {{path/to/file.chd}}`
- View CHD metadata information:
`chdman info {{[-i|--input]}} {{path/to/file.chd}}`
- Update a CHD file to the latest format version:
`chdman copy {{[-i|--input]}} {{path/to/old_file.chd}} {{[-o|--output]}} {{path/to/new_file.chd}}`
- Convert a compressed hard drive image to uncompressed (for editing):
`chdman extracthd {{[-i|--input]}} {{path/to/disk.chd}} {{[-o|--output]}} {{path/to/disk.img}}`