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Dolphin can't play games directly from compressed archives (7zip/zip/gzip/rar...). Instead, it utilizes its own compression method. '''This format has been deprecated in favor of [[#RVZ (Modern Dolphin format) - GC/Wii|RVZ]].'''
→GameCube / Wii: The information was out-of-date
However compressed formats incorporating the "padding zeroing" part were made since then, and Dolphin supports them! These are the WBFS and GCZ formats.
Dolphin can't play games directly from compressed archives (7zip/zip/gzip/rar...). Instead, it utilizes its own compression method.
===GCZ (Dolphin native archive format) - GC/Wii===
* '''Archive-quality dump?''' Not directly Yes (can be restored with NKitif junk data is not removed).* '''Gain:''' Immediate (ISO dump size lowers). Considerable, depending Depends on the game. It is very minimal if junk data is not removed.* '''Tools Used:''' Dolphin (right-click the game(s) in the games list and select "Compress ISOConvert File..." (or "Compressed selected ISOsConvert Selected Files..." if more than one is selected), and select GCZ), [https://wiki.gbatemp.net/wiki/NKit NKit], or [https://wit.wiimm.de/ wit (Wiimms ISO Tools)]* '''Can be reverted?''' Yes. You can (In Dolphin, right-click on the GCZ-compressed (in blue) ISOs in Dolphin and choose "Uncompress selected ISOsgame, select "Convert File.. Garbage data for Wii titles will be zeroed out and thus different from the official dump but will have no effect on gameplay in most cases - if desired can be unscrubbed [https://gbatemp.net/threads/new-app-nkit-restore-shrink-" and-preserve-disc-images-in-playable-formerly-swiit.533402/ NKitRestore]select ISO.Removed junk data is irreversible)
* '''Playable on Hardware?''' No
* '''Playable on Emulators?''' Only Dolphin. Some examples:* Super Mario Anniversary (Wii): 4.7 GB (original) > 12 MB (GCZ) (!!)* Super Smash Bros Brawl (Wii): 7.8 GB (original) > 7.1 GB (GCZ) (main cause is FMV's low compression)* Xenoblade PAL (Wii): 7.8 GB (original) > 6.3 GB (GCZ)* Super Mario Galaxy 2 (Wii): 4.7 GB (original) > 1.8 GB (GCZ)* Tales of Graces (Wii): 4.7 GB (original) > 4.2 GB (GCZ) (game data already fills the disk)* Animal Crossing (GC): 1.4 GB (original) > 26 MB (GCZ)* 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 (GCZ) (sound data is stored as uncompressed stream to fill disk)
===RVZ (Modern Dolphin format) - GC/Wii===
The Dolphin team developed a new compression format based on WIA called RVZ. Unlike all the previous formats, RVZ is lossless and can preserve the padding data on Wii discs as well as the necessary files needed by the Wii's IOS. Usage is very similar to GCZ in Dolphin itself, but it only works on newer Dolphin versions.
* '''Archive-quality dump?''' Yes.(if junk data is not removed)* '''Gain:''' Immediate (ISO dump size lowers). Considerable, depending on the game.* '''Tools Used:''' Dolphin 5.0-12188+ (right-click the game(s) in the games game list and select "Compress ISOConvert File..." (or "Compressed selected ISOsConvert Selected Files..." if more than one is selected), and select RVZ)* '''Can be reverted?''' Yes(In Dolphin, right-click the game, select "Convert File..." and select ISO. Removed junk data is irreversible)* '''Playable on Hardware?''' No.* '''Playable on Emulators?''' Only Dolphin.
===Scrubbing and Trimming - GC/Wii===
