I have a naomi CF box from barcia modder, and the CF card he made for me (which works) and 4 other CF cards I had laying around, 2 x 256 cisco, 1 x 1gb cisco, 1 x 512 sandisk.I'm using a 256mb netdimm flashed with 4.02 firmware and an ABC.BIN CF zerokey chip.
All cards are FAT formatted prior to use in disk managment in windows.
I have tried both noamicf tools and gcfi, I am able to read the ID from all the cards fine with NCF tool and ataid, and I can write a game with gcfi in win 10 with the IDE card and with a USB to CF adapter to all the cards I have, this gives me no errors at all when writing them, the only time I see an error is if I use NCF tools on the XP box via IDE to CF and it gives the "could not write security patch error", but it works without error on XP with the USB to CF adapter.
All cards end up with GAME.BIN and ABC.BIN on them.
The 2 x 256mb, and 1 x 1gb cisco cards boot into an error 21 and go no further, and the 512mb sandisk card boots and goes through the checking memory, loading, checking memory on a loop about 3 times before giving error 26.