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→GameCube / Wii
===GCZ (Dolphin native archive format) - GC/Wii===
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]].'''
* '''Archive-quality dump?''' Not directly (can be restored with NKit).
* 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.
* '''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 list and select "Compress ISO..." (or "Compressed selected ISOs..." if more than one is selected))
* '''Can be reverted?''' Yes.
* '''Playable on Hardware?''' No.
* '''Playable on Emulators?''' Only Dolphin.
===Scrubbing and Trimming - GC/Wii===
