![Amazon.com: WD 4TB 7200 RPM SATA 6 Gb/s 64MB Cache, 3.5-Inch Desktop Hard Disk Drive (WD4003FZEX) : Electronics Amazon.com: WD 4TB 7200 RPM SATA 6 Gb/s 64MB Cache, 3.5-Inch Desktop Hard Disk Drive (WD4003FZEX) : Electronics](https://m.media-amazon.com/images/I/91asLqfLhSL.jpg)
Amazon.com: WD 4TB 7200 RPM SATA 6 Gb/s 64MB Cache, 3.5-Inch Desktop Hard Disk Drive (WD4003FZEX) : Electronics
![Amazon.com: WD 4TB 7200 RPM SATA 6 Gb/s 64MB Cache, 3.5-Inch Desktop Hard Disk Drive (WD4003FZEX) : Electronics Amazon.com: WD 4TB 7200 RPM SATA 6 Gb/s 64MB Cache, 3.5-Inch Desktop Hard Disk Drive (WD4003FZEX) : Electronics](https://m.media-amazon.com/images/I/81DRB0+o1eL._AC_UF894,1000_QL80_.jpg)
Amazon.com: WD 4TB 7200 RPM SATA 6 Gb/s 64MB Cache, 3.5-Inch Desktop Hard Disk Drive (WD4003FZEX) : Electronics
![Amazon.com: Western Digital WD4001FAEX WD Black - Hard drive - 4 TB - internal - 3.5 inch - SATA-600 - 7200 rpm - buffer: 64 MB : Electronics Amazon.com: Western Digital WD4001FAEX WD Black - Hard drive - 4 TB - internal - 3.5 inch - SATA-600 - 7200 rpm - buffer: 64 MB : Electronics](https://m.media-amazon.com/images/I/712MLP5GoIL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Western Digital WD4001FAEX WD Black - Hard drive - 4 TB - internal - 3.5 inch - SATA-600 - 7200 rpm - buffer: 64 MB : Electronics
![Amazon.com: Western Digital WD 4TB My Passport Portable External Hard Drive with backup software and password protection, Black - WDBPKJ0040BBK-WESN : Electronics Amazon.com: Western Digital WD 4TB My Passport Portable External Hard Drive with backup software and password protection, Black - WDBPKJ0040BBK-WESN : Electronics](https://m.media-amazon.com/images/I/51CDEElxPFL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Western Digital WD 4TB My Passport Portable External Hard Drive with backup software and password protection, Black - WDBPKJ0040BBK-WESN : Electronics
![WD Black WD4005FZBX - Hard drive - 4 TB - internal - 3.5-inch - SATA 6Gb/s - 7200 rpm - buffer: 256 MB | Dell USA WD Black WD4005FZBX - Hard drive - 4 TB - internal - 3.5-inch - SATA 6Gb/s - 7200 rpm - buffer: 256 MB | Dell USA](https://snpi.dell.com/snp/images/products/large/en-us~AA088346/AA088346.jpg)
WD Black WD4005FZBX - Hard drive - 4 TB - internal - 3.5-inch - SATA 6Gb/s - 7200 rpm - buffer: 256 MB | Dell USA
![Western Digital Black WD4004FZWX 4 TB 3.5" Internal Hard Disk Drive (HDD) SATA III 6.0Gb/s 7200 RPM 128 MB | Fast Server Corp. www.srvfast.com Western Digital Black WD4004FZWX 4 TB 3.5" Internal Hard Disk Drive (HDD) SATA III 6.0Gb/s 7200 RPM 128 MB | Fast Server Corp. www.srvfast.com](https://www.srvfast.com/media/catalog/product/cache/73f179befb2b664ec3794b7759101d79/w/d/wd4004fzwx-pf1.jpg)