WD40EFZX Western Digital Red Plus NAS 4TB 5400RPM SATA 6Gbps 128MB Cache 3.5-inch Internal Hard Drive Digital Storage Capacity 4 TB Hard Disk Interface Serial ATA-600 Connectivity Technology eSATA Brand Western Digital Hard Disk Form Factor 3.5 Inches Hard Disk Description Mechanical Hard Disk Compatible Devices Desktop Color 4TB Hard Disk Size 4 TB Hard Disk Rotational Speed 5400 RPM.
eBay