mobos will not let a DVD drive be the Master. I have one such, a SOYO, I have the DVD as the Slave on the secondary controller, because as the Master I got the same message. Verified with SOYO that it must be slave.

I find it annoying, in a way, because I have nothing on the Master and use cable select so the the master connector has nothing attached. This is not good practice because then it is possible that there will be reflections from the unterminated port POSSIBLY causing bad reads/writes. However, the ATAPI drive data is not particularly fast and thus is probably not a practical problem.

I guess that one could use Slave jumpering rather than Cable Select and then put the DVD drive on the end connector, where it will be seen as a slave. I wanted to stick with CS jumpering in the event I decide to add a drive later.