stands for Compressed Hunks of Data . It is a file format originally created for the MAME (Multiple Arcade Machine Emulator) project. Its primary purpose was to represent the hard drives and compact discs used by arcade machines (like the Naomi or Atomiswave) in a single, compressed file.
: The LR-PCSX2 core also supports CHD, making it popular for handheld devices like the Steam Deck or ROG Ally. ps2 chd roms