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* '''Archive-quality dump?''' No (changes disc structure, some gameplay issues)
* '''Gain:''' Immediate (ISO dump size lowers). Substantial, depending on game. Increases load times on real hardware but not emulators.
* '''Tools Used:''' CISO, CISO GUI, maxcso, UMDGen or PSP ISO Compressor
<br />CISO GUI (CISO is command line-based): Drag-and-drop ISO file on program, Select compression level (1 to 9 (Max)), "Compress", and choose directory for saving the new CSO file.
<br />UMDGen is a PSP ISO editor. You can save to either the CSO format with this.
* Zelda Four Swords Plus Japan (GC): 1.4 GB (original) > 480 MB (GCZ)
* Zelda Twilight Princess (GC): 1.4 GB (original) > 1.4 GB (GCZ) (game data already fills the disk)
* Megaman Collection (GC): 1.4 GB (original) > 1.1 GB (originalGCZ) (sound data is stored as uncompressed stream to fill disk)
People used to resort to WiiScrubber (Wii) and GCM Utility (GC) to scrub/trim games to end up with dumps that while they had no immediate size change, their randomized garbage data (like "dummy", "padding" or "znull") was still there but zeroed out making archived dumps using zip/7zip/rar formats have stunning gains (from 1.4GB uncompressed to 26MB zipped for Animal Crossing for example!). Of course the file still needed to be uncompressed to its full size everytime you wanted to play it.
