Install the second hard drive assembly into the outer case.

Be sure that the mounting holes line up with the threaded holes in the outer case as seen in the second picture.

When the logic board is installed, simply connect the second hard drive cable to the free socket on the logic board.

The second hard drive cable should lay flat between the two hard drives. If the second hard drive cable is placed on top of the first, the antenna plate will not reattach, and you could damage your cable.