The CHD algorithm has improved. Older CHD packs used compression level c0 (fast). Modern "UPD" packs use c0 to c5 with verify, resulting in smaller file sizes without performance loss.
As of early 2026, has become the definitive storage format for PlayStation 2
Here’s a sample post you could use or adapt:
: PS2 games are often 4.3GB (DVD size). CHD compression can frequently reduce this by 40-60% , especially for games that contain a lot of "padding" or empty data on the disc.
