The Mac uses a proprietary SWIM (Super Woz Integrated Machine) floppy controller, the successor to the earlier WIM (Woz Integrated Machine) that only supported 800K floppies.See the following addresses for more information:
http://www.angelfire.com/ca2/tech68k/quadra.html
http://www.linuxhq.com/kernel/v2.2/patch/patch-2.2.18/linux_drivers_block_swim_iop.c.html
http://devworld.apple.com/techpubs/hardware/Developer_Notes/Macintosh_CPUs-68K_Desktop/
Official 68kMLA Music and NeXT Expert
OpenStep Page at http://openstep.topcities.com/
Macs Liberated: SE, IIsi, Quadra 700, 6100, PB 5300, PowerMac 5400
PCs liberated from Windoze: 3