A data storage system includes a memory circuit having memory cells and a control circuit. The via extends into semiconductive material of the substrate. Friction between the shaft and the leaf spring acts as a rotation-suppressing force on the shaft. In another embodiment, a conveyor oven includes air circulating fingers having at least first and second air discharge apertures with different flow areas for providing heated air to a cooking chamber of the oven. The second intermediate structure is different from the first intermediate structure.