I have the same problem.
My mac doesn't see the HDD in the superdrive adapter. But (i've tried!), my HDD is fine if i plug it through external usb case (that i've bought to make internal superdrive works as external-one).
I've also tried to switch the SSD (now in the main drive-bay) with the HDD (in the superdrive-shape bay). What can i do??Maybe the Sata superdrive connector is fired?
HELP!!