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→GameCube / Wii
===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
===FST (extracted File System) - GC/Wii===
* '''Archive-quality dump?''' No(Yes, if --raw option is used, which disables scrubbing)
* '''Gain:''' Very low with GC ISOs, much better with Wii ones. Can also be combined with classic archives compression (ZIP/RAR/7z etc.) to match WIA and NKit compression ratios.
* '''Tools Used:''' [https://wit.wiimm.de/info/composing.html wit]
* '''Can be reverted?''' Partially via the align-files.txt created by wit when extracting.
* '''Playable on Hardware?''' (GC games on Wii/Vwii): Yes - ([https://github.com/FIX94/Nintendont/ Nintendont]. () / Other combinations): No* '''Playable on Emulators?''' Yes - (Dolphin (both GC and Wii)
This has the advantage of easy experimenting with [[#Destructive Modification]]. Includes all disadvantages of trimming.
===WIA (Wii ISO Archive) - GC/Wii only?===* '''Archive-quality dump?''' Not directly unless No (Yes, if --raw option is givenused, effectively preventing any space savings.which disables scrubbing)* '''Gain:''' Immediate (ISO dump size lowers). More ; more than WBFS.(No gain if not scrubbed and compression not used)* '''Tools Used:''' wit, Dolphin* '''Can be reverted?''' Maybe No (same caveats as WBFSYes, if --raw option was used (wit), or "Remove Junk Data" wasn't used (Dolphin)).
* '''Playable on Hardware?''' No
* '''Playable on Emulators?''' Yes(Dolphin)
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?''' Not directlyYes (No (Wii games), can be restored with NKitif the Wii update partition is removed and the recovery file not preserved)* '''Gain:''' Immediate - (Wii) only for GCZ format.* '''Tools Used:''' NKit.* '''Can be reverted?''' Yes.(unless the Wii update partition was removed and the recovery file not preserved)* '''Playable on Hardware?''' (GC) : Yes - (ISO-based variant only () / 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 full decryption and optionally splitting the often non-unique update partitions to separate files.
