Catweasel Experts out there???

Hi, I've been sitting on some Amiga, C64, Apple ][e and other disks which I've wanted to read, so for the heck of it I bought a Catweasel ISA card with DOS drivers to try out. I'm wondering if there are any seasoned experts out there that use one of these little wonders. I hooked it up into my Win 98 system and plugged in a 1.44MB IBM Floppy and a 1.2MB 5.25" IBM Floppy to it, it sees the 3.5" as Drive 0: and the 5.25" as Drive 1: When I put in a disk, it is telling me what it is, for instance an Amiga 880K or a an Apple ][ Disk. But then I get an error in German: Allgemeiner Fehler: Das Medium enthalt ein unbekanntes dateisystem Which translates to: General Error: The Media Contains an Unknown Filesystem The only problem is I'm getting this error EVERY time I go to read any of my disks, except an IBM formatted 720K diskette which actually brings up a directory, other then that I get nothing but the error above. Anyone familiar enough with the device and used it enough to know what I may be doing incorrectly, thanks for the help. CUrt