@Thomas
I'm pritty sure you're wrong on that account... there are 3 headers but only one of the 2 headers for Channel 1 can be used at any time.
@wurzel
You're laptop drive is most likely jumpered as master if you've not messed with trying to jumper it so the seccond drive need to be jumpered as slave before any drive on that channel will be accepted.
If you could explain how you're setup is chained together, jumpered and with what cabeling it would be much easier to point to any flaws there might be.
