If you legally own physical PSX discs and have ripped them to BIN/CUE (using software like ImgBurn), you can convert them to CHD using a command-line tool. Here is the step-by-step process.
Even with perfect CHD files, issues arise. Here is how to fix them. chd psx roms
: Unlike other formats, CHD is 100% lossless. You can compress a .bin/.cue file into a CHD and later decompress it back to the exact original files if you need to apply a translation patch or mod. If you legally own physical PSX discs and
Furthermore, CHDs solve the issue of "data rot" and format obsolescence. A bin/cue pair relies on an external text file remaining perfectly synced with a massive binary file. Over decades of being copied between hard drives, uploaded to file-sharing sites, and compressed into zip or 7z archives, the likelihood of desynchronization is incredibly high. A CHD is a monolith. Its header contains all the track layout, sector size, and compression metadata. It is practically immune to the kind of user-error that plagues older formats. Here is how to fix them
There are two primary reasons the retro-gaming community prefers CHD over traditional BIN/CUE or ISO formats: