chdman extractcd -i input.chd -o output.iso
: Place chdman.exe in the same folder as your PS2 .iso files.
: These are considered "good" files because they are bit-perfect copies verified by groups like Redump.org The Private Tracker Mystique ps2 chd roms exclusive
While it requires a tiny bit more CPU overhead to decompress, the smaller file size can lead to faster loading times from slower storage media, like SD cards. REPORT: Analysis of PlayStation 2 (PS2) CHD ROMs