Don't go buy a CF adapter cause it won't help. I just said that so you know what config I am using.
What I meant was that you need to format it or something with an amiga filesystem before it MAY work. The card did not appear on workbench in my real machine, but when I stuck the card in my PC and mounted it in WinUAE, it did show as, "NDOS" or something like that. I then followed KG's guide I mentioned in my previous post and when I stuck it back in my real machine, it worked.
So the card my not work in your real machine, but it may work if you mount it and format it through WinUAE.
I apologise for butting in, but I thought my experience might shed some light on your problem.