Are you actually running the SFS formatted CF card on the A600?

AFAIK SFS won't work on an A600 as the SFS file system requires the minimum of a 68020 processor. I tried to use SFS with my A600 a while back. Set a 10GB HDD up on the PC using WinUAE and SFS, but when connected to the A600 it refused to work because of the 68000 processor.

If you have got a SFS formatted CF card working with an A600 I'm very interested in how.

I ended up having to use a 6GB HDD formatted to 4GB, using FFS, on my A600.