It does need termination someplace. If the internal drive isn't terminated, then it won't work. You can test this by terminating the SCSI buss with an external drive, or even an empty drive enclosure as long as it supplies termination and term. power. If the internal drive shows up, termination is your problem. The internal and external ports are on the same buss, so you need to terminate the internal drive and the last external device (if any) in the SCSI chain. Enabling termination on drives varies a lot from installing jumpers to installing resistor packs to who knows what. Good luck!