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→CHD Compression
===CHD Compression===
* '''Archive-quality dump?''' Yes(with CHD version 5)
* '''Gain:''' Immediate
* '''Tools Used:''' chdman (included with MAME)
* '''Can process multi track bin files?''' Yes.
MAME uses the CHD format for disc images in general and includes tools to convert back and forth. It Before MAME v145, CHD was in version 4 and it bumped to version 5 from MAME v146 and further. The CHD v5 uses 7zip's LZMA compression on the game data and lossless FLAC compression for the audio data to optimize compression even further than using BIN+CUE+MP3/WAV data separation alone. CHDv5 is truely lossless.
'''Instructions'''
Place chdman.exe and extractcd in the same directory as the dumps you want to compress (dumps must be in BIN+CUE formator GDI). Open Command Prompt and navigate to the directory where you placed chdman.exe and input one of the following:* BIN/CUE -GDI to CHD: <code>for /R %i in (*.cue, *.gdi) do chdman createcd -i "%i" -o "%~ni.chd"</code> (Windows)
* CHD to BIN/CUE: <code>for /R %i in (*.chd) do chdman extractcd -i "%i" -o "%~ni.cue"</code> (Windows)
Alternatively, if you only need to do one file you can use this: <code>chdman createcd -i "<FILENAME>.cue" -o "<FILENAME>.chd"</code>
