For those who still want to save space without breaking the game, the industry standard is moving away from "highly compressed" (which often implies broken) to CHD (Compressed Hunks of Data)
Most "highly compressed" editions use and file deduplication to shrink video files (usually .PSS or .SFD). The compression tools (like ePSXe’s built-in tools or third-party repackers) strip: wwe smackdown vs raw ps2 highly compressed fix
If your game has entrance music but no commentary or crowd noise: For those who still want to save space
: Leftover save data from other series entries (e.g., SvR 2008 data affecting SvR 2009) can cause "Corrupt Data" warnings. wwe smackdown vs raw ps2 highly compressed fix
Use 7-Zip to ensure no data is lost during decompression.