This is the most critical factor for preservationists. Unlike zipping a file (which you have to unzip to play) or converting to an MP3-based format (which degrades audio quality), CHD is lossless .
: Unlike the .PBP format (often used for PSP), CHD is completely lossless, meaning you can convert it back to the original .bin/.cue with zero data loss using CHDMAN . How to Convert Your Games psx chds