Kingston 4Gb standard card works flawless here,its what I use for back-up data in PCMCIA slot.
If you have all the files in the correct place and it still does not work,then it maybe something to do with motherboard reset. Here the card appears regardless of what file system it is using (just quick format).
You could insert card after you have booted in workbench to see if it appears. Here I do not have this problem as I have the hardware reset which allows most PCMCIA card(s) to be swapped without soft reset.
I also have tri-colour LED for PCMCIA port which makes it easier here "card detect" and "card enabled".