For copying between disks of varying format I have got by with various lash-ups over the years before finally deciding to make something a bit tidier and so built a unit which holds four different drives and allows for the selection of two out of the four drives to be selected for connection to a computer e.g. BBC/Master.
I have built a simple PCB to which four drives can be connected, it has two rotary switches which are used to select two drives out of the four connected.. LED's show which drives are enabled and active.
Details of the full build can be found here: Quad Disk Drive
(these are photos of an early board, I have now centered the switches vertically)
Power for the drives is taken separately from the power supply to the drives, only a low current +5V connection is required to power the LEDs.
The four links allow each drive to be configured as drive 0 or 1 depending on how the drive links have been set. Particularly useful for 3.5" drives which are often fixed as drive 1.
Five individual ribbon cables are required to each drive and to the computer, of course do not use (PC) cables with twists in them !
Schematic
Bill Of Materials
Blank PCB
