What does the TerraMaster F4-421 offer for storage?

The F4-421 is pure 4-bay SATA storage with no M.2 slots, no NVMe cache, and no expansion. It accepts 3.5-inch and 2.5-inch HDDs and SSDs in all four bays. If your workload fits on a straightforward SATA array, this TerraMaster delivers without complications.