Originally designed for MAME (Multiple Arcade Machine Emulator) to compress CD-ROMs from the Sega CD and PlayStation 1, CHD has recently been adopted by PPSSPP (the leading PSP emulator) and modern handhelds like the Steam Deck and Anbernic devices.
the storage efficiency of CSO and the data integrity of ISO. psp chd internet archive better
chdman createcd -i game.iso -o game.chd -f psp chd internet archive better