CHD format is typically supported on most of the Retroarch cores.  I have slowly moved most of mine from iso/bin formats over to CHD.  It does save quite a bit of space plus it can be uncompressed back to original format/CUE/ISO etc if needed.  There have been version changes to CHD over years (up to 5 now) which have improved the archiving and compression process so best to use current CHD.EXE if compressing files.  Here is a listing for the larger game files: PS2 - use GZip format.  se
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