Enhance and Upgrade your desktop computer or Media Device, DVR with storage and performance booster hard drive from Seagate Model Number ST4000DM000 4Tb 5900rpm 6Gb/s 64Mb Internal Cache 3.5 inch SATA Internal hard drive. This hard drive can be used as internal hard drive for desktop, or externally with optional USB case. In addition, ST4000DM000 Hard drive can be used in a desktop, external storage device, or media, DVR units.

https://serverdiskdrives.com/products/seagate-st4000dm000-4tb-64mb-sata-6-0gb-s-3-5-hard-drive