STII5X1PM-B Storage Tower II (black color) with 1 5X1 eSATA Port Multiplier installed. Comes with 2 standard 5 1/4" drive bays, a strong power supply and in a compact footprint, the Storage Tower can accommodate up to 2 full height optical drives or 3 3.5" hard drives; or a combination of these devices in various mixes.