You can buy internal pass-through 50 pin active terminators. If your final device does not have termination (which seems strange to me), you put this device in between the ribbon cable and the drive. You can buy active and passive versions on Ebay. I would recommend the active version.
Alternatively, you can buy a ribbon cable with multiple connectors on it, connect your last drive to the second last connector on the cable, and use an internal active terminator on the final connector of the cable.
