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→GameCube / Wii: simplified wording + news about NKit
Dolphin can't play games directly from compressed archives (7zip/zip/gzip/rar...). Instead, it utilizes its own compression method.
* '''Archive-quality dump?''' Yes for GC games, Not directly for Wii games. (checksum won't Can be the same, no gameplay issues - may be unscrubbed restored with [https://gbatempNKit).net/threads/new-app-nkit-restore-shrink-and-preserve-disc-images-in-playable-formerly-swiit.533402/ NKitRestore])
* '''Gain:''' Immediate (ISO dump size lowers). Considerable, depending on the game.
* '''Tools Used:''' Dolphin (right-click the game(s) in the games list and select "Compress ISO..." (or "Compressed selected ISOs..." if more than one is selected)); , [https://wiki.gbatemp.net/wiki/NKit NKit], or [https://wit.wiimm.de/ wit (Wiimms ISO Tools)]
* '''Can be reverted?''' Yes. You can right-click on the GCZ-compressed (in blue) ISOs in Dolphin and choose "Uncompress selected ISOs". 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].
* '''Playable on Hardware?''' No
* '''Gain:''' Not Immediate for just scrubbing (ISO dump size the same); Immediate for trimming (ISO dump size lowers).
* '''Tools Used:''' GC-Tool ("wipe garbage data..." - Scrubbing for GameCube), GameCube ISO Trimmer (scrubbing and trimming for GameCube), WiiScrubber (scrubbing for Wii, although compressing with Dolphin will scrub it anyways).
* '''Can be reverted?''' Yes, with WiiScrubber's undo file or (in case of scrubbing) [https://gbatempNKit.net/threads/new-app-nkit-restore-shrink-and-preserve-disc-images-in-playable-formerly-swiit.533402/ NKitRestore]
* '''Playable on Hardware?''' Yes for scrubbing; some games won't work trimmed.
* '''Playable on Emulators?''' Yes for scrubbing; some games won't work trimmed.
Scrubbing games zeros out garbage/dummy data in the ISO file. The resulting file will be the same size, but it will be able to compress better than unmodified ISOs. The difference can be huge depending on the game. Animal Crossing, for instance, will compress to just a 26 MB .gcz file after being scrubbed!
Trimming games implies (also known as "trucha scrubbing", but and substantially different from the definition of "trimming" used in ROM-based systems) games will also remove defragment the garbage/dummy data outrightfiles moving them towards the start of the disc image, resulting in a smaller ISO file. The trimmed file can be used immediately at a smaller size without compression, but the game's internal structure will be wholly modified. '''Several games (the ones Games relying on direct sector access, (as opposed to consulting the filesystem) will break if you trim them.'''
===WBFS - Wii only===
* '''Tools Used:''' [http://www.wiibackupmanager.co.uk/downloads.html Wii Backup Manager] (after adding your game, go to "Transfer" and select "WBFS") or wit (Wiimms ISO Tools).
* '''Can be reverted?''' Maybe. WBFS files can always be converted back to ISO, but they will remain scrubbed (can be unscrubbed with NKitRestore) and, depending on settings at the time of conversion to WBFS, may be missing update/extras partitions (can be laboriously readded with wit and a copy of the missing data).
* '''Playable on Hardware?''' ''' Yes - Preferred format by most SD/USB loaders'''
* '''Playable on Emulators?''' Yes - Dolphin
* '''Tools Used:''' Wii Backup Manager (same as above, but select "CISO" - possibly Wii only), wit
* '''Can be reverted?''' Maybe. CISO files can always be converted back to ISO, but they will remain scrubbed (can be unscrubbed with NKitRestore).
* '''Playable on Hardware?''' Yes (on Wii /Vwii only) - Nintendont for Gamecube games, uLoader for Wii games
* '''Playable on Emulators?''' Yes - Dolphin
* '''Playable on Emulators?''' No
A scrubbed and compressed format designed for maximum space savings without cutting corners on corruption detection, but it's not directly playable or editable. Never really caught on and may be considered de facto deprecated by NKit. ===NKit formats - GC/Wii===* '''Archive-quality dump?''' '''Yes - by explicit design choice!'''* '''Gain:''' Immediate or not depending on choice of GCZ- or ISO-based output.* '''Tools Used:''' NKit.* '''Can be reverted?''' Yes!* '''Playable on Hardware?''' (GC) Yes? (Wii) No* '''Playable on Emulators?''' Yes - Dolphin Apart from its previously mentioned unscrubbing/untrimming features mentioned in the above formats' descriptions, NKit is able to convert any ISO (clean dump or otherwise) to and from an [https://wiki.gbatemp.net/wiki/NKit/NKitFormat intermediate format applying various reversible changes] that optimize the image for lossless compression, including various options such as splitting the often non-unique update partitions to separate files.
==Wii U==
