To put this in perspective: You CAN'T use real Amiga floppy disks on the AmigaOS 4, MorphOS, Aros or the FPGA based solutions either. Piracy is the only solution there as well 
um. i do. my SAM has a catweasel MK4+ card and i can use it with both amiga disks and C64 disks, although the latter requires the use of VICE to run anything. the
driver, written for OS4, should also work on MorphOS if you have a power mac. as far i as know, anyone with a normal PC can use the card in conjunction with winUAE as well.
oh, and i'm not only OS4 user doing this: mike brantley talks about it on his
web page.
-- eliyahu