If you are a fan of PlayStation 1 emulation, you have likely heard the gospel of CHD files. For years, the standard for PS1 emulation was the .bin/.cue pair or the single .iso file. While functional, these formats are relics of the 90s—inefficient, bulky, and prone to organizational headaches.
However, if you want CHD specifically:
The short answer is:
Use a modern frontend. If you are absolutely married to ePSXe's specific GPU plugins (like Pete's OpenGL) that aren't available in other emulators, you should convert your CHD files to the PBP (PSP Eboot) format instead. ePSXe handles PBP files natively, and they are similarly compressed. epsxe chd files
Enter the CHD (Compressed Hunks of Data) format. Originally designed for the MAME arcade emulator, CHD has become the gold standard for disc-based game compression. But here is the question that plagues retro gamers: Does ePSXe support CHD files? If you are a fan of PlayStation 1