: If you own PSX discs, use chdman to compress them losslessly. You’ll get ~40–50% size reduction with no quality loss and no “fix” needed.
Standard ZIP or RAR compression does little for PSX ISOs. Why? Because PSX discs contain two types of data: psx highly compressed roms fixed
Unlike older methods that removed FMVs or music, CHD preserves 100% of the original game data. Direct Play: : If you own PSX discs, use chdman