(part of the MAME tools). It’s a command-line tool that "munchies" your .bin files into .chd.
Because the data is indexed in "hunks," modern processors can decompress the information in real-time faster than an original PS1 could read from a physical laser. Ps1 Roms Highly Compressed
His CPU usage spiked to 100%. The fans whined, a high-pitched scream of effort. It wasn't just unzipping the file; it felt like the computer was rebuilding it from the atomic level up. The file size counter on his desktop began to tick upward. (part of the MAME tools)