my 1G Kingston (japan) looks virtually identical to my 1G Toshiba. So probably made by toshiba
I have an apacer 512MB and a 1G Sandisk.
they were all detected to be able to run at x4 (x30 speed) on the Supercard DS. I have never formatted them. SO I assume that they are in FAT16 format
I haven't had any problems with v1.1, personally I think it is an improvement.
I use both toshiba and kingston (japan) 1GB cards.
If there r any games I could test for you. Just let me know here.