The Lenovo ThinkCentre M730q pairs an M.2 NVMe slot with a SATA drive bay

The M730q follows the standard mini PC blueprint: an M.2 2280 slot for NVMe PCIe Gen 3 x4 SSDs plus one 2.5-inch SATA III bay for a hard drive or SSD. There are no extra SATA ports dangling off the board, so whatever you put in the bay is your bulk storage — no external expansion.