Hi,
Make sure the WD 250GB drive is strapped correctly (you only have strapped, right).
I have recently been working with the exact configuration - I have a lot of them with 2 each 250GB drive configurations.
I have the left drive (end drive with the strap - it goes vertical down the pins, not across the pins by the way), the right drive is without a strap.
You must have one strapped and one not. You can't have 2 drives strapped or 2 drives with no strap.
Before adding tunes read the current thread entitled "250GB Drives" in the General section of the List Forum.
Ross
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In SI, a little termination and attention to layout goes a long way. In EMC, without SI, you'll spend 80% of the effort on the last 3dB.