WD4001FFSX Western Digital Red Pro WD4001FFSX, 4Tb/4000gb, Sata3(6Gb/s), 64mb cache, Host to/from drive (sustained): 171mb/sec, 7200rpm, with multi-axis shock sensor, co-virbration protection (designed for...
Amazon.com: WD Red Pro 4TB NAS Hard Disk Drive - 7200 RPM SATA 6 Gb/s 64MB Cache 3.5 Inch - WD4001FFSX : Electronics
WD Red Pro WD4003FFBX 4TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive - Newegg.com
WD WD4001FFSX - 4TB 7.2K SATA 6.0Gbps 3.5" 64MB Hard Drive
Western Digital Red Pro 4TB NAS WD4001FFSX Consumer HDD Review
Western Digital Red Pro 4TB NAS WD4001FFSX Consumer HDD Review