Floppy Drive Cable Problems

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  Many (perhaps most) A4000s were shipped with improperly-wired floppy
  cables. These cables had wires 3-5 twisted, instead of wires 4-6. These
  cables will work fine for a single drive, but will not properly connect a
  second drive. To use two drives that are both jumpered as DS0, the floppy
  cable should have both wires 4-6 and 10-12 twisted. A cable with only wires
  4-6 twisted will require the drives to be jumpered as DS0 and DS1.

  An improperly-wired or failing floppy cable can cause a high-density drive
  to only work with double-density disks.

  Pin-outs for the internal floppy connector are shown in Internals/Connector 
  Pin-Outs/Internal Floppy Connector Pin-Outs.