I am dealing with the same issue on a SCA drive connected to a 50-pin cable with a 50-pin to 80-pin drive adapter. I'm thinking one of these four ways should be successful but .. which one? The SCA drive I'm using (and most - all? - SCA drives) provides no termination so I'm going to have to have a terminator on the cable. Do I ...

1. get a 50-pin inline terminator to go between the 50-pin cable and the adapter (or logic board).

2. get an 80-pin inline terminator to go between the adapter and the SCA drive.

3. get a 50-pin to 80-pin adapter to go between the logic board and an 80-pin cable plus an inline 80-pin terminator to the drive.

4. get a 50-pin to 80-pin adapter to go between the logic board and a multi-connection 80-pin cable plus a terminator for the third cable connection (the one after the logic board and the drive).

5. Get a different 50-pin to 80-pin adapter that has termination onboard.