WD Ultrastar DC HC550 18TB Enterprise Hard Drive, 3.5" SATA 6Gb/s, 7200 RPM, 512MB Cache (WUH721818ALE6L4)

• WD Ultrastar DC HC550 enterprise hard drive with 18TB of capacity
• 7200 RPM spindle speed and 512MB cache
• SATA 6Gb/s interface in a standard 3.5-inch form factor
• Built for data center and enterprise NAS workloads
• Model: WUH721818ALE6L4 | QNAP part number: 7211318T-7050000-000-RS

An 18TB WD Ultrastar enterprise drive supplied by QNAP for business NAS and server storage.