Hey man, I had a problem and there was already a topic. So if I must, bump I shall.
OT: So if I just remove some games, run the card, then put the games back on it'll work?
EDIT: Okay, so to fix it just delete DSYSTEM entirely. Of course, I would backup all the files anyway, although IMO it's unnecessary. When the card re-initializes, it will recreate the DSYSTEM folder and voila, it works!
I'm trying to update my firmware, but my R button is broken...so I can't enter safe mode to flash it. So I can't play FFIV or FFCC.
Oh yeah, and what does udisk.nds do? I ran it and when I went to USB mode it showed my vers. was 1.45, but my PC (XP) said it wasn't formatted. The next time I went to USB mode, it reverted to vers. 1.44.