Compressed ^new^: Psx Games Highly

Use CHD for archiving. Use .PBP for PSP/Anbernic devices. Avoid heavily lossy "highly compressed" packs unless you have no alternative.

This is the gold standard for emulation. You find a game that is originally 600MB compressed down to 300MB using the or .rar format. psx games highly compressed

Many PS1 discs were mostly empty space. Compression tools identify these "zeroed out" sectors and effectively ignore them in the final file. Use CHD for archiving