Only used bigger cards internally. I use my CF card for transfers so I have a 32Mb & 128Mb for the PCMCIA adaptor. Certainly use original SANDisk Ultra II CF Cards, 4GB in my A1200 and 8GB in my A4000.
I think FAT16 has a maximum partition size of 2GB. Yep just checked it now on Microsoft.
So Less than 2GB is probably the go.
Anyone used more than that in a PCMCIA adaptor.?