Thanks, after I disable the acpi (actually just choose option 2 from the boot menu!), I got my floppy drive back. I also follow your instruction and change the load.conf. Is it okay just to leave it...
My FreeBSD install at ad0s1, and Windows 2000 at ad2s1.
Everytime I start my FreeBSD, it shows me this message:
fdc0: cmd 3 failed at out byte 1 of 3
pmtimer 0 on isa0
fdc0: cannot reserve I/O...