To convert your existing library, you will need a utility called CHDMAN, which is part of the MAME project.
No format is perfect. Before you convert your entire library, note: ps2 chd roms top
files for PS2 games often take up 2GB to 4GB each, quickly devouring storage. Enter the CHD (Compressed Hunks of Data) format—the current gold standard for PS2 ROM compression. What are PS2 CHD ROMs? compression format originally developed for the MAME project PS2 CHD ROMs — Top Guide What CHD is
Direct Play: Most top-tier emulators, including PCSX2 and mobile options like AetherSX2, support CHD natively without needing to unzip. How to Convert Your Games CHD (Compressed Hunks of Data): a disk-image container
Problem: The game runs slower than the ISO version. Solution: This is a myth on modern hardware. If you have a CPU older than 2015 (Intel 3rd gen or older), decompressing CHD in real-time might slow you down. For everyone else, CHD is faster because it reduces the PCIe bandwidth load.