Not sure, i think I tried one of the mario kart wii versions and it did not so i had to convert it to wbfs but it was over a year ago now!
Edit... Yeah the wiki says not for Wii usb loaders!
Correct, the NKit format does not work on any of the Wii loaders. Not sure if support will ever be added. You'll need to convert it to an ISO for Wii Backup Manager to convert it to the usual .wbfs format.
I just got into NKit myself within the last 2 weeks. I was missing a few Wii titles and where I got them from they were only available in the NKIt format. I don't like command line programs, but I did figure out a way to use it to get what I needed.
1 - Download NKit (current version v1.4)
2 - Download the Wii title in NKit format
3 - Drag and drop the Wii title onto the CONVERTTOISO file in the NKit directory (the conversion will start)
----Note that you can drop multiple files onto it as well and it will work through them one at a time until complete.
4 - If NKIt is not setup with the databases for file varification that's ok, it'll still work, mine did.
5 - Once the 4 step conversion process to ISO is completed go to the NKit/Proccessed/Wii_MatchFail directory to find your ISO.
5 - Use Wii Backup Manager on that ISO to make your .wbfs file.
Kind of a pain, but I only had to do a handful.
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you might be able to have most of the wii library on a 2TB drive uncompressed, but there is a lot of shovelware on there. I probably have a lot of trash. I was downloading furiously while using usenet. I had an rss feed to download any new wii games it found like every 15 minutes it would check.
I have about 1800 Wii titles in .wbfs format. Some do not compress much, like the sining and dancing game (gussing it is the music files) and others are so small you can not believe it. Averaged out the size comes in about 1.75GB each. I am in the US, so most of my games are US but I do have quite a few games that are PAL and from other regions, plus all the different version numbers and Mario Kart customs. They take up a little over 3.2 TBs and adding in the GameCube games adds in almost another 1TB. But you can eliminate most of the singing, dancing and versions to squeeze it onto a 4TB hard drive.
To get EVERYTHING onto one drive you'll need a 5TB hard drive. I find the Western Digital drives work the best. See link in my signature if you want to give it a go using just one FAT32 partition.