WD Red Pro 2TB 3.5" SATA NAS Hard Drive 7200RPM 64MB WD2002FFSX-68PF8N0
It features a 7200 RPM spindle speed, 64MB cache, and SATA 6 Gb/s interface. This is a tested drive suited for compatible NAS systems, servers, and desktop systems that support standard SATA hard drives.