Here we have a selection of connecting cables.
The two ribbon cables are the 20-way cables which connect the Winchester discs to the Adaptec board. The ACB-4000 supports two Winchester disc drives, which is rather lucky as otherwise you would need two Host Adapters and two Winchester Controllers.
One of the drives has to be set as drive 0 and the other as drive 1. Drive 0 is then connected to J0 on the Adaptec board and drive 1 is connected to J1. If you get this wrong, the drives will not be recognised by the BBC and you will get disc errors.
The power cable is the standard BBC floppy disc drive power cable which I have been using to run a Winchester disc off the BBC.