No.
512K, 512Ke, Plus, and SE. SE FDHD (1.44MB drive upgrade) I'm not sure about.
There was discussion about a strange INIT for the SE/30, but nobody has it anywhere. The Mac II is still up on the air: I seem to recall something about the HD20 with the Mac II. You'd probably need some kind of NuBUS card because the Mac II doesn't have a floppy drive port, or hack some kind of weird thing which hooks into one of the floppy connectors on the motherboard. IFAIK the Classic II was the last one to have a port on the back for an external FDD. Even if you could plug it in, the ROMs won't have support for the HD20 in the first place.
512K, 512Ke, Plus, and SE. SE FDHD (1.44MB drive upgrade) I'm not sure about.
There was discussion about a strange INIT for the SE/30, but nobody has it anywhere. The Mac II is still up on the air: I seem to recall something about the HD20 with the Mac II. You'd probably need some kind of NuBUS card because the Mac II doesn't have a floppy drive port, or hack some kind of weird thing which hooks into one of the floppy connectors on the motherboard. IFAIK the Classic II was the last one to have a port on the back for an external FDD. Even if you could plug it in, the ROMs won't have support for the HD20 in the first place.