a li
a little late, but I'll answer that:
1)
in USBLoaders, It seems newer devices have detection issues. (not necessarily flash drives, it just seems to be affecting all devices)
this can be easilly fixed by using IOS58 instead of cIOS.
You don't have that problem with nintendont, because it always uses IOS58.
2)
it affects a lot of flash drives, but not ALL of them, that's why some people will argue flashes are fine :
a lot of flash device have issues with the write command.
they can be read fine (listing files, loading games, etc.), but can freeze and hang when writing to them, like creating file or just saving data to existing files.
It happens when generating or saving the nintendont memory card ! or on USBLoaders when dumping a disc to USB.
if nintendont crashes while you exit a game, it's very bad, it means it crashed while saving the memory card...
If you have that bug, it can corrupt your entire FAT32 partition and you'll lose your data, games and savegames. (no idea with exFAT)
But, like said, it's not affecting all devices. So, just try, and be sure you keep a backup of all your files located on that device, just in case.