![Amazon.com: Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD42PURZ : Electronics Amazon.com: Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD42PURZ : Electronics](https://m.media-amazon.com/images/I/71KGby9PZkL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD42PURZ : Electronics
![Amazon.com: Western Digital 4TB WD Blue PC Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, 256 MB Cache, 3.5" - WD40EZAZ : Electronics Amazon.com: Western Digital 4TB WD Blue PC Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, 256 MB Cache, 3.5" - WD40EZAZ : Electronics](https://m.media-amazon.com/images/I/71duAeVO8zL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Western Digital 4TB WD Blue PC Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, 256 MB Cache, 3.5" - WD40EZAZ : Electronics
![Amazon.com: WD 4TB Elements Portable HDD, External Hard Drive, USB 3.0 for PC & Mac, Plug and Play Ready - WDBU6Y0040BBK-WESN : Electronics Amazon.com: WD 4TB Elements Portable HDD, External Hard Drive, USB 3.0 for PC & Mac, Plug and Play Ready - WDBU6Y0040BBK-WESN : Electronics](https://m.media-amazon.com/images/I/41fJs1xw6bL.jpg)
Amazon.com: WD 4TB Elements Portable HDD, External Hard Drive, USB 3.0 for PC & Mac, Plug and Play Ready - WDBU6Y0040BBK-WESN : Electronics
![Amazon.com: Western Digital 4TB WD Blue 3D NAND Internal PC SSD - SATA III 6 Gb/s, 2.5"/7mm, Up to 560 MB/s - WDS400T2B0A : Electronics Amazon.com: Western Digital 4TB WD Blue 3D NAND Internal PC SSD - SATA III 6 Gb/s, 2.5"/7mm, Up to 560 MB/s - WDS400T2B0A : Electronics](https://m.media-amazon.com/images/I/716p0BCqo9L._AC_UF894,1000_QL80_.jpg)