Currently Being ModeratedNov 14, 2012 3:09 PM (in response to rocklebee)
From your description I'm going to point you in the direction of your mini-SAS card.
mini-SAS isn't a standard option provided by Apple, therefore it has to be a third-party card, and likely has a third-party kernel extension (or driver) to support the card.
Unfortunately it's not easy to test that theory without pulling the drive offline (unless the drive supports multiple interfaces and you can connect it via FireWire, at least temporarily as a test).
In either case I'd talk to the card vendor to see if they have any software updates for the card's driver.