I got my thread locked on the ds-x forums for mentioning FAT 32.
It works if you use FAT 32 to an extent. You get some white screens, games saves won't save, etc. You are supposed to use FAT 16 as indicated on the DS-X site. When I use FAT 16 though, my files become corrupt and I get the "qkin" folder bug. Then my games get erased and such.
I order an R4 for backup.